X can do a piece of work in 40days. He works at it for 8days and then Y finished it in 20 days. How long will Y take to complete the work?	Choose one:
A) 10
B) 12
C) 25
D) 18
E) 20
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 20 days   Whole work will be done by Y in  20*5/4= 
<gadget id="calculator"> 20*5/4</gadget>
<output>25</output>
25days   Answer is 25
<result>C</result>
X can do a piece of work in 40days. He works at it for 8days and then Y finished it in 20 days. How long will Y take to complete the work?