P can do a work in 24 days. Q can do the same work in 9 days and R can do the same in 12 days. Q and R start the work and leave after 3 days. P finishes the remaining work in --- days.	Choose one:
A) 7
B) 8
C) 9
D) 10
E) 11
Explanation :   Work done by P in 1 day = 1/24   Work done by Q in 1 day = 1/9   Work done by R in 1 day = 1/12   Work done by Q and R in 1 day = 1/9 + 1/12 = 7/36   Work done by Q and R in 3 days = 3×7/36 = 7/12   Remaining work = 1 – 7/12 = 5/12   Number of days in which P can finish the remaining work = (5/12) / (1/24)= 
<gadget id="calculator">(5/12) / (1/24)</gadget>
<output>10</output>
10   Answer : Option 10
<result>D</result>
P can do a work in 24 days. Q can do the same work in 9 days and R can do the same in 12 days. Q and R start the work and leave after 3 days. P finishes the remaining work in --- days.