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Updated on: 01 Aug 2018, 10:09
Originally posted by sarojpatra on 17 Nov 2005, 01:02.
Last edited by Bunuel on 01 Aug 2018, 10:09, edited 2 times in total.
Last edited by Bunuel on 01 Aug 2018, 10:09, edited 2 times in total.
Renamed the topic, edited the question and added the OA.
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
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59% (02:18) correct
41%
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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
Attachment:
Untitled.png [ 1.11 KiB | Viewed 35246 times ]
09 Aug 2014, 10:21
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Surface area of the box with dimensions a,b,c is \(S=2(ab+bc+ac)\)
Here we have S=2(20*2+2*8+20*8)=2*216=432. Now check the answers:
(A) 17*25=16*25+25=425 Less.
(B) 21*24=20*24+24=504 Good!
(C) 24*12 definitely less than A
(D) 24*14 less than A
(E) 26*14=25*14+14 less than A
The correct answer is B.
Here we have S=2(20*2+2*8+20*8)=2*216=432. Now check the answers:
(A) 17*25=16*25+25=425 Less.
(B) 21*24=20*24+24=504 Good!
(C) 24*12 definitely less than A
(D) 24*14 less than A
(E) 26*14=25*14+14 less than A
The correct answer is B.
11 Oct 2014, 10:00
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Above two images show three ways to cover the rectangular ways. We can easily see that option B (21 X 24) covers the second method with (20 X 24). hence B.
Attachments
File comment: Wrapping the rectangular box with paper
Slide2.JPG [ 14.97 KiB | Viewed 33552 times ]
File comment: Wrapping the rectangular box with paper
Slide1.JPG [ 32.78 KiB | Viewed 33392 times ]
