X can do a piece of work in 40days. He works at it for 8days and then Y finished it in 28 days. How long will Y take to complete the work?  Options:  A) 10  B) 12  C) 15  D) 18  E) 35
Work done by X in 8days = 8*1/40 = 1/5   Remaining work = 1 - 1/5 = 4/5   4/5 work is done by Y in 28 days   Whole work will be done by Y in  28*5/4= 
<gadget id="calculator"> 28*5/4</gadget>
<output>35</output>
35 days   Answer is 35
<result>E</result>
X can do a piece of work in 40days. He works at it for 8days and then Y finished it in 28 days. How long will Y take to complete the work?