X can finish a work in 25 days. Y can finish the same work in 20 days. Y worked for 12 days and left the job. how many days does X alone need to finish the remaining work?
Choose the correct choice from the following answers.
A) 2	B) 5	C) 6	D) 7	E) 8
Work done by X in 1 day = 1/25   Work done by Y in 1 day = 1/20   Work done by Y in 12 days = 12/20 = 3/5   Remaining work = 1 – 3/5 = 2/5   Number of days in which X can finish the remaining work = (2/5) / (1/20)= 
<gadget id="calculator">(2/5) / (1/20)</gadget>
<output>8</output>
8   8
<result>E</result>
X can finish a work in 25 days. Y can finish the same work in 20 days. Y worked for 12 days and left the job. how many days does X alone need to finish the remaining work?