Question

# A and 13 together can do a piece of work in 12 days: B and C can do it in 20 days whilci C and A can do it in 15 days. A. B and C all working together can do it In (a) 6 days (b) 9 days (c) 10 days (d) 1012 days

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Solution

## A and B's 1 day's work =112 B and C's 1 day's work =120 C and A's 1 day's work =115 Adding we get, 2(A,B and C)'s 1 day's work =112+120+115 =5+3+460=1260=15 ∴ A,B and C's 1 days work =15×12=110 ∴ That will finish the work in =10 days

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