P can complete a piece of work in 18 days & B can do the same piece of work in 15 days. They started working together but after 3 days P left & Q alone completed the remaining work. The whole work was completed in how many days?	Choices:
A) 12days	B) 12.5 days	C) 13 days	D) 14.5 days	E) 15 days
Both together worked for 3 days.   In 3 days , P can do = 3 x   1   18   =   1   6   th work   In 3 days, Q can do = 3 x   1   15   =   1   5   th work   In 3 days , work finished =   1   6   +   1   5   =   11   30   12.5 daysalance work =   19   30   12.5 daysalance work finished by Q =&gt; Time taken by Q to finish the balance work =   19   30   x 15 = 9.5 days   The whole work was completed in  9.5 + 3= 
<gadget id="calculator"> 9.5 + 3</gadget>
<output>12.5</output>
12.5 days   12.5 days
<result>B</result>
P can complete a piece of work in 18 days & B can do the same piece of work in 15 days. They started working together but after 3 days P left & Q alone completed the remaining work. The whole work was completed in how many days?