exam Maths Puzzle Numerical Ability

A and B can do a piece of work in 42 days, B and C in 31 days and A and C in 20 days. In how many days can all of them do the work?

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7+3T/4= T/8 A picture frame is 32inches by 17 inches 489 in^2 of picture shows. Find the thickness to the nearest 10th.