A and B together can complete a work in 15 days. They started together but after 5 days A left the work. If the remaining work is completed by B in 15 more days, then A alone can complete the entire work in how many days?

Options

A. 2
B. 5
C. 8
D. 4

Answer

B

Explanation

By MDW formula,
Total work = `48xx 40` = 1920 units
Now, `1920 = 64 xx X + (64 + 32) xx (50//3)`
`rArr` 1920 = 64X + 1600
`rArr` 64X = 320
` rArr` X = 5