x can finish a work in 18 days and y can do the same work in 15 days. y worked for 10 days and left the job. In how many days, x alone can finish the remaining work ?

A) 4 days

B) 5 days

C) 9 days

D) 6 days

y's 10 day's work = (1/15 * 10) = 2/3

so remaining work = (1-(2/3)) = 1/3

x work done in 1 days = 1/18

so finish the 1/3 work= (18 * (1/3)) = 6 days

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