X can do a piece of work in 20days. He works at it for 10days and then Y finished it in 12days. How long will Y take to complete the work?
Choose the most appropriate option.
A) 10 B) 12 C) 24 D) 29 E) 30
Work done by X in 10days = 10*1/20 = 1/2   Remaining work = 1 - 1/2 = 1/2   1/2 work is done by Y in 12days   Whole work will be done by Y in 12*2= 
<gadget id="calculator">12*2</gadget>
<output>24</output>
24days   Answer is 24
<result>C</result>
X can do a piece of work in 20days. He works at it for 10days and then Y finished it in 12days. How long will Y take to complete the work?