X can finish a work in 18 days. Y can finish the same work in 15 days. Yworked for 5 days and left the job. how many days does X alone need to finish the remaining work?
Choices:
A) 12	B) 5	C) 6	D) 8	E) 9
Work done by X in 1 day = 1/18   Work done by Y in 1 day = 1/15   Work done by Y in 5 days = 5/15 = 1/3   Remaining work = 1 – 1/3 = 2/3   Number of days in which X can finish the remaining work = (2/3) / (1/18)= 
<gadget id="calculator">(2/3) / (1/18)</gadget>
<output>12</output>
12   12
<result>A</result>
X can finish a work in 18 days. Y can finish the same work in 15 days. Yworked for 5 days and left the job. how many days does X alone need to finish the remaining work?