L&T Company Numerical Ability Time and Work

A, B and C can do a piece of work in 40, 30 and 24 days respectively. They start the work together but B leaves 6 days before the completion of the work. In how many days is the work completed? [A]14 [B]12 [C]13 [D]11

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L&T Other Question

A circular playground with 60 m diameter is surrounded by a 5 m wide road. What is the area of the road?
[A] 65π [B] 30π [C] 35π [D] 325π
Some persons can do a piece of work in 36 days. Three times the number of these people will do one-fourth of that work in?