X can finish a work in 20 days. Y can finish the same work in 16 days. Y worked for 12 days and left the job. how many days does X alone need to finish the remaining work? Answers.
A) 2	B) 3	C) 9	D) 5	E) 8
Work done by X in 1 day = 1/20   Work done by Y in 1 day = 1/16   Work done by Y in 12 days = 12/16 = 3/4   Remaining work = 1 – 3/4 = 1/4   Number of days in which X can finish the remaining work = (1/4) / (1/20)= 
<gadget id="calculator">(1/4) / (1/20)</gadget>
<output>5</output>
5   5
<result>D</result>
X can finish a work in 20 days. Y can finish the same work in 16 days. Y worked for 12 days and left the job. how many days does X alone need to finish the remaining work?