Percentage Practice Test 5 with solutions

Question : 37 of 40

Marks: +1, -0

A number gets reduced to 30 by a reduction of 10%. To convert it into 40, the number should be increased by___.

Solution:

The number become is 30 by the reduction of 10%
So, 90% of x = 30

90/100x=30

x=100/3

To convert it into 40, the number should be increased by

={(40-100/3)×100}/{100/3}=20%

So, the number is increased by 20%.

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