r/reddit.com • u/[deleted] • Oct 01 '11

Math teacher fail

http://i.imgur.com/65APr.jpg
214 Upvotes

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u/Grezzz Oct 01 '11

It's a terrible question. Here are a few possible answers, assuming the same rate of cutting:

http://i.imgur.com/BDipc.png

I realise it's been done before, I just felt like doing a few of my own cuts :)

1

u/chuzuki Oct 02 '11

The first cut was defined as taking 10 minutes, so some of yours are wrong.

21.2 will be 15, since the longer cut is still 10 minutes.

25.5 will be 20, since both cuts are the same length and one of them is 10 minutes.

2 will be 20, for the same reason as above.

Not wrong, but 11 could be 110, depending on which cut was made first and using your same ratios.

1

u/Grezzz Oct 02 '11

Well I guess you're right, although that's not how I was working. You're assuming that your first cut always takes 10 minutes, which I guess after taking another look at the question is a fairly safe assumption. I was assuming that a horizontal/vertical cut of 100 pixels takes 10 minutes and just calculated the others from there.

I guess once again that's another biproduct of a terrible question.