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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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