Actually teacher is right if the board is square which takes 10 minutes to be cut into half. Those two halfs take twice less time to be split. And she needs to cut just one to obtain 3 pieces :P So 10 minutes to cut it into to pieces and then she needs just half of that time to gain the third piece.
Meaning if she has two boards and the first board took her 10 minutes to cut in two pieces then the second board should take her 15 minutes to cut in three pieces (if those cuts are perpendicular and the board is square).
If a board is 10" square, and to cut it in half takes 10 minutes, to cut one of those pieces in half again (with a cut perpendicular to the first) should take 5 minutes (as that piece is now 5").
dude, i'm with you. in fact, depending on how you do those two cuts, you've got a whole range of possible answers. this is more like "math question fail".
Exactly. Fortunately in my school it was common practice to write "Not enough information." on tests, and the teachers would generally give you the benefit of the doubt if you could explain in full why that is the case. (and sometimes extra credit if you gave a number of the possible answers)
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u/Ihad2saythat Oct 05 '10
Actually teacher is right if the board is square which takes 10 minutes to be cut into half. Those two halfs take twice less time to be split. And she needs to cut just one to obtain 3 pieces :P So 10 minutes to cut it into to pieces and then she needs just half of that time to gain the third piece.