exam Maths Puzzle Numerical Ability

A, B and C can finish a job in 6 days. If B and C work together, the job will take 9 days; if A and C work together it will take 8 days. In how many days can each man working alone do the job?

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exam Other Question

The base of a ladder is 7 feet away from the wall. The top of the ladder is 7 feet from the floor. Find the length of the ladder to the nearest thousandth. I need to find the area of a triangle whose base is 3c+4 and height is 3c+4. Could you please help me. Thank you