Question:A can do a certain job in 12 days. B is 60% more efficient than A. The number of days, it take  B to do the same piece of  work, is : 

A 6 
B `6 1/4` 
C `7 1/2` 
D 8 

+ Answer
C 

+ Explanation
solution:
Ration of times taken by A and B =`160 : 100 = 8 : 5`.
`8 : 5 :: 12 : X`
or `8x = 5 xx 12`
or `x = 7 1/2` days.

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Md. Habib Ullah

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