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31 Jul 2019, 10:17
Kudos
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B
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Difficulty:
15%
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Question Stats:
85% (01:09) correct
15%
(01:44)
wrong
based on 60
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If the width of a rectangle is increased by 10% and the length is decreased by 20%, by what percent does the area decrease?
A. 5
B. 12
C. 15
D. 20
E. 21
A. 5
B. 12
C. 15
D. 20
E. 21
31 Jul 2019, 10:23
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Bookmarks
Bunuel
If the width of a rectangle is increased by 10% and the length is decreased by 20%, by what percent does the area decrease?
A. 5
B. 12
C. 15
D. 20
E. 21
A. 5
B. 12
C. 15
D. 20
E. 21
inital w = 10 new = 11
intial L = 20 . new = 16
% change in area = 200-176/200 ; 12%
IMO B
31 Jul 2019, 10:32
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Bunuel
If the width of a rectangle is increased by 10% and the length is decreased by 20%, by what percent does the area decrease?
A. 5
B. 12
C. 15
D. 20
E. 21
A. 5
B. 12
C. 15
D. 20
E. 21
New width = 1.1 width
New length = .8 length
New Area = 1.1 * .8 area
=.88 area
=(1-12%) area
IMO B
