A can do a piece of work in 10 days and B in 20 days they begin together but A leaves 2 days before the completition of work. In how many days will the whole work work be completed?
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Answer:
8 days
Step-by-step explanation:
A 10
B 20
LCM of 10,20 is 20 so A's 1 day efficiency is 2
B's 1 day efficiency is 1
A left 2 days before so A's 2 day work is 2*2=4
20+4=24 24/3=8
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