A and B can do a piece of work in 30 days, while B and C can do the same work in 24 days and C and A in 20 days. They all work together for 10 days when B and C leave. How many days more will A take to finish the work? Choose one
A) 18 days	B) 24 days	C) 30 days	D) 36 days	E) 35 days
Explanation:   2(A + B + C)'s 1 day's work =(1/30 +1/24+1/20)=15/120=1/8   Work done by A, B, C in 10 days =10/6=5/8.   A's 1 day's work =(1/16 - 1/24)=1/48   Now,	1/48 work is done by A in 1 day   So,	3/8 work will be done by A in (48 X 3/8)= 18 days.   18 daysNSWER IS 18 days
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A and B can do a piece of work in 30 days, while B and C can do the same work in 24 days and C and A in 20 days. They all work together for 10 days when B and C leave. How many days more will A take to finish the work?