A can do a work in 12 days and B in 24 days. If they work on it together for 4 days, then what fraction of work is left?
Let the total work = LCM of 12 & 24 = 24 units
A's efficiency = 24/12 = 2
B's efficiency = 24/24 = 1
In 1day they can complete 3 units of work
In 4days they can complete 12 units of work
work left =24-12 = 12 units
fraction of work left = 12/24 = 1/2
So the answewr is option B.
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