A and B together can complete a work in 12 days. A alone can complete it in 20 days. If B does the work only for half a day daily, then in how many days A and B together will complete the work?
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Step-by-step explanation:
A+B=12 efficiency=5
LCM=60
A=20 efficiency=3
Efficency of A+B=5
Efficency of B=2
B half day work=2×1/2=1
Time to complete work A+B=60/4=15 days
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