This teacher needs some help

SaintsAngels · 10 months

A simple answer as to why it takes 20 minutes:

It took Marie 10 minutes to cut the piece of wood once to create 2 pieces. It will, therefore, take Marie 10 minutes to cut a piece of wood again. 10+10 = 20

Teacher: 10minutes/create 2 pieces (which is wrong), the correct "formula" is 10 minutes/cut. It takes 1 cut to get 2 pieces. So 10min/1cut *2 cuts.

airforcefalco · 10 months

I once graded a military test with a question that was a T/F type and was similar to "2 + 2 does not equal 4" to which one student, no joke, crossed out "not" on the test and put True on his answer sheet.

It was the only time someone ever got that question wrong.

robert_penis · 10 months

This thread is full of candidates for " Are you smarter than a 5th Grader"

bommasaurus · 10 months

Actually, 15 minutes could make sense. Given that the board is square and that you always have to cut a piece in half (which was not mentioned). If cutting a square board in half takes you 10 minutes. Cutting one of the halves in two would take you 5 minutes. In that setting the least time to cut three pieces is 15 minutes.

ProfessorPoo · 10 months

Good god, get a miter saw!

lordsmish · 10 months

Hahahaha i get it Marie is a woman

hired_goon · 10 months

can we all agree though, that marie is the worst sawer in the world? who takes 10 minutes to cut a board?

this is yet another problem that can be solved with power tools.

fsakes · 10 months

if you wet the wood and bend it in half.. 1 cut will produce 3 pieces, which would take 10mins.

ffxpwns · 10 months

Could this be a viable option? It's what I first though of.

griffith12 · 10 months

"oh wait guys, lets assume that we are cutting a 2X4 lengthwise and it never says they have to be equal so.." shut the fuck up.

has anyone posting in this thread ever picked up a fucking saw in their life?

teacher is wrong, kid is right. QED.

Protocol2319 · 10 months

Two cuts one girl.

fargin_ice_hole · 10 months

I'm wondering why it took Marie longer than 10 seconds to saw through the board in the picture.

SalamiJack · 10 months

Everyone factoring in length or width is thinking way too hard about the question. It's not a length or width question, it's a cut per time problem.

The teacher made an error because she is associating pieces per time, not cut per time. Two pieces in 10 minutes = one piece per 5 minutes. This is a logical fallacy the teacher is making because each piece is a subdivision of one board.

Thus if one 10 minute cuts makes two pieces, if you work at the same speed making another cut should take another 10 minutes, or 20 minutes overall. Any factor of length/width frankly makes zero sense to include in the problem statement. It just isn't there guys.

theblackprofessor · 10 months

People make simple mistakes all the time, it's not that big of a deal to those of you saying she should lose her job over this

plastiqmanb · 10 months

Math teachers are not carpenters. However you could probably learn more from a carpenter teaching you math.

Axoren · 10 months

Marie had already measured twice when she cut the first time, so she could shave off 5 minutes from the second cut.

Hyperdude · 10 months

The real question is why is it taking her so long to cut wood?

cobknob · 10 months

If it takes one woman nine months to have a baby, how long will it take two women to have a baby?

TheOriginalMyth · 10 months

TIL that it takes 5 minuets to cut a board into 1 piece

exoscythe · 10 months

If its a square piece then when it is cut in half the first time the width of the wood for each individual piece is also halved. One of the pieces is then cut along the shorter length. Because the shorter length is half what the original was it only takes half as long, therefore 10min for the first cut and 10/2=5 min for the second cut resulting in a total of 15 minutes to obtain 3 pieces of wood.
Regardless, this problem is worded very vaguely and the teacher shouldnt have marked the student's answer wrong as both answers are viable based on the given information.

Bitchin_Wizard · 10 months

can someone please talk about how wrong the teachers math is instead of what the actual math is? that shit is the joke.

th3virus · 10 months

Stare_Decisis · 10 months

I wonder if anyone can give me an accurate equation explaining why this repost and others like it seem to make the front page?

El_Corrector · 10 months

It actually depends on HOW the board cut.

biggeryellowvan · 10 months

Oh it's a circular piece and cuts are radial, tada!

twadebald · 10 months

I think the key phrase here is "just as fast". In which case, the problem makes sense.

[deleted] · 10 months

If it's anything like the teacher books we had throughout school (90's), all of the answers are written down as well as solutions, so teachers just essentially copy/paste whatever text on there. Doesn't necessarily mean the teacher was the one that got an easy question wrong, just that they are lazy and didn't do the test themselves like most of our teachers did to make sure everything was correct.

dave_casa · 10 months

The correct answer is 10 minutes and a few seconds. The first cut should be made close to the edge of the board. The second cut only needs to be through this thin slice.

TillyWilly1983 · 10 months

I find this really disturbing. When I was 12 I used the word liable in an acrostic of my name in English class. Teacher said it wasn't a real word and made me take it out. There was no dictionary in the room. I've been suspicious of adults ever since.

elvis1403 · 10 months

What is she using a nail file?

P4ngurB4n · 10 months

It's actually slightly more than 20, unless she's dual wielding saws.

Trumpetjock · 10 months

15 technically could be correct, but so could a whole bunch of answers. The question assumes, but does not state, that you are cutting the board on the same plane. If your first cut was very near the end of the board, you could rotate the small portion 90 degrees and cut through a much smaller mass of wood than the first cut. Therefore you could end up with three pieces in fifteen minutes, if that mass was exactly half the mass cut through in the first cut.

That's really confusing.... Maybe I should fire up my ms paint skills.

jglee1236 · 10 months

I think Marie needs help on how to use a fucking saw. 10 minutes? Is she using a soup spoon to cut that board?

Young_Clean_Bastard · 10 months

I had the dumbest teacher ever for freshman biology in high school. In was in the morning section, a friend of mine was in the afternoon section. We were doing probability as an introduction to genetics. The question was: you have a deck of cards, and pick a queen on your first draw. What are the odds that you pick a queen on your second draw? The teacher was convinced that it was 1/169. I tried to reason with her, we got in a long argument, but I finally thought I had convinced her. I told my friend about it at lunch. Then she did the exact same thing in the afternoon class, and he had to convince her she was wrong. Ugh, what a dumbass.

noagendaproducer · 10 months

Do we know for a fact it is a teacher that did this and not a teacher's aid? When I was in high school, teachers would use students that had free class periods as their aid and make them grade the papers for them.

ImPigBoT · 10 months

There is an illustration of the board and saw to the right. The teacher is NOT correct. I want to know who the teacher is.

shadoway · 10 months

You have people with absolutely no sense of logic trying to teach kids important things like this, with no concept of reality.

sejkorat · 10 months

could be right, depending on how you look at it.

if you were to cut a straight thin board into 3 pieces, with 10 minutes per cut, then yes, it'd take 20 minutes

if you were to cut a square board into 3 pieces (not all the same size, one would be 1/2 of the board while the other 2 would be 1/4 of the board), then yes, 15 minutes is the right answer

but based on the picture, its the first one, and that teacher needs to eat a dick.

johnq-pubic · 10 months

The wood was in the form of a Möbius strip.
2 pcs would take 2 cuts. 5 minutes per cut.

3 pcs would then take 15 minutes
Teacher seems legit.

bourom · 10 months

Say the Piece of Wood is a perfect square.

You cut it in half in 10 mins. (horizontally)

Keep the 2 pieces together (so they still form a square) and cut it in half perpendicularily. (Vertically)

Stop at 5 minutes.

You have 3 pieces in 15 minutes.

sbrbrad · 10 months

20 is correct because she is sawing "another" board into 3 pieces. Thus, 10 minutes per cut and two cuts = 20 minutes

ermintwang · 10 months

Whenever this gets reposted, it's always interesting to note how everyone assumes the teacher is female.

brandonwarrant · 10 months

The item writing on this question is brutal. the phrase "if she works just as fast..." would make the answer 10 minutes. There should not be this must subjectivity/malleability in a completion item on a test.

legendcc · 10 months

Word problem says another board. This means a new board. So you take the math of the first and apply to a different scenario. If it said the same board into 3 pieces it would be 20. I can see the fail worded word problem and would show the teacher the trick question.

iwantaredditaccount · 10 months

I was thinking, why is this link purple, I haven't been on Reddit in a while and I upvote or downvote stuff so that way when I'm browsing on another computer I know what I have seen. The only plausible reason that the link was purple is because it was a fucking repost (and not that funny of one either).

IamSparticles · 10 months

This works if you assume Marie started with a square piece of wood, cut it in half, then cut one of the resulting pieces in half. The second cut would be half the length of the first cut.

Ramnza02 · 10 months

I'd like to see someone use a saw to cut a piece of wood into one piece.

j2kal · 10 months

I cut this board three times, and it's still too short!

selectix · 10 months

If it takes a teacher 5 minutes to grade 2 tests incorrectly, how many wrong answers can the teacher "correct" in 30 minutes?

DangerousIdeas · 10 months

An EASIER answer is that it takes Marie 10 minutes to CUT a board. If she has to cut two times, then it will take 2 x10 or 20 minutes.

Purple6391 · 10 months

All I got out of this is that girl sucks at sawing boards.

garandx · 10 months

10 minutes to cut a board in half??? Wtf was she doing using her nail file?

[deleted] · 10 months

Maybe the question could have been more specific. Seems to me that everyone's confused as to what they mean.

elint · 10 months

If the wood is a cube, and it takes 10 minutes to saw through it, you would be left with 2 rectangular prisms. Each of them should have 1 dimension that can be cut in half the original time, requiring 5 extra minutes for 3 pieces and another 5 extra minutes for 4 pieces.

quillandsaber · 10 months

How about we agree that the question was horribly phrased, and that we need to stop doing questions like this?

I personally prefer the one where Marie is sick, and her doctor told her to take three pills one at a time, waiting thirty minutes between pills. How long does it take before she's had all the pills?

lonnez · 10 months

Well if you have a square board and cut it into two pieces, then wanted to cut one of those pieces into 2 more pieces, then it would depend on the way that you cut it. If you cut it parallel to your first cut, then yes, it would take 10 minutes more, but if you cut it perpendicular, then it would only take 5 more minutes.

EDIT: She needed to be clearer.

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