A can do a piece of work in 10 days, B and C can do it in 15 days and A and C can do it in 20 days. How long will they take to do it together and individually?
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(A+B ) s 1 day ' s work = 1/10
(b+c) s 1 days work = 1/15
(a+c) s 1 days work = 1/20
2(a+b+c) s 1 days work = 1 /10+1/20+1/15= 13/60
a+b+c s 1days work = 13/120
working together ,they will do it in 9 3/13 days
a 's 1 day work = 13/120 - 1/15 = 1/24
a will do work in 24 days
B 's 1 days work = 13/120 - 1/20= 7/120
B will do the work in 17 1/7 days
c s 1 days work = 13/120- 1/10 = 1/120
C will do the work in 120 days
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