tricky box question

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tycoon_316: Junior | Next Rank: 30 Posts; Posts: 14; Joined: Fri Jul 04, 2008 5:12 pm

tricky box question

by tycoon_316 » Fri Jul 11, 2008 7:35 am

17. The figure above shows the dimensions of a rectangular box that is to be completely wrapped with paper. If a single sheet of paper is to be used without patching, then the dimensions of the paper could be
(A) 17 in by 25 in
(B) 21 in by 24 in
(C) 24 in by 12 in
(D) 24 in by 14 in
(E) 26 in by 14 in

Please provide me explanation for this question thanks
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Source: Beat The GMAT — Problem Solving | Fri Jul 11, 2008 7:35 am

gxliu: Junior | Next Rank: 30 Posts; Posts: 21; Joined: Mon Jun 23, 2008 4:54 am; Thanked: 2 times

by gxliu » Fri Jul 11, 2008 8:03 am

asnwer is B.
Think about logically. In order to wrap the box, the paper has to cover the entire box, which is the surface area of the box. Surface area comes out to be 432. So the area of the paper has to be greater than or equal to 432. Only B is enough.