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Mensuration Practice Test 10
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© examsnet.com
Question : 36
Total: 40
If the length of a rectangle is increased by 60% by what per cent must its width be decreased so as to maintain the same area?
50%
60%
37.5%
66.23%
Validate
Solution:
Let length and width be l and b respectively.
Area of rectangle = l × b
New area of a rectangle when length is increased by 60% and let breadth be decreased by x %
=
160
l
100
×
(
b
−
x
b
100
)
= lb
=
160
100
×
(
100
−
x
100
)
= 1
= 100 - x =
1000
16
=
100
−
1000
16
= x
=
600
16
= x
= 37.5 % = x
© examsnet.com
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