A can do a bit of work in 5 days, which B alone can do in 20 days. How long both cooperating can do it?
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Answer:
4 days
Step-by-step explanation:
LCM APPROACH
A = 5days
B = 20days
LCM(5,20)=20
This is the total work i.e = 20 units
So A per day work =20/5=4 units
B per day work =20/20=1 units
Per day work when A and B together works = (4+1)units=5units
So A and B together take 20/5 days to complete the entire work.
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