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Time and Work - General Aptitude

Q1:

Sakshi can do a piece of work in 20 days. Tanya is 25% more efficient than Sakshi. The number of days taken by Tanya to do the same piece of work is:

A 15

B 16

C 18

D 25

ANS:B - 16

Ratio of times taken by Sakshi and Tanya = 125 : 100 = 5 : 4. Suppose Tanya takes x days to do the work.

5 : 4 :: 20 : x     x = 4 x 20
5
 x = 16 days. Hence, Tanya takes 16 days to complete the work.