L&T Company Numerical Ability Time and Work

A, B and C can do a piece of work in 24, 30 and 40 days respectively. They start
the work together but C leaves 4 days before the completion of the work. In how
many days is the work done?

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L&T Other Question

Some persons can do a piece of work in 16 days. Two times the number of
these people will do half of that work in?
6 men and 10 boys finish a piece of work in 4 days, 5 men and 6 boys do it in 6
days. The ratio between the efficiencies of a man and boy is?