A and B can do a piece of work in 4 days, while C and D can do the same work in 12 days. In how many days will A, B, C and D do it together? *
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A and B do a work in days = 4
C and do the same work in days= 12
A and B's one day's work = 1/4
B and C's one day's work= 1/12
Both will complete work in one day = 1/4+1/12
=3+1/12
=4/12
=1/3
Both will complete work in 3 days.
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