A and B together can do a piece of work in 6 days. If A can alone do the work in 18 days, then the number of days required for B to finish the work is.

Options

A. A. 10
B. B. 12
C. C. 9
D. D. 15

Answer

C

Explanation

मानाकि B, x दिनों में उसे पूरा कर सकता है।
` therefore (x xx 18)/(x + 18) = 6`
` rArr 8x = 6x + 108`
`rArr 12x = 108`
` rArr x = 108/12 = 9`