book Maths Puzzle Numerical Ability

It takes 16 days for Tom, the carpenter, to build a house. He started building the house and worked by himself for 7 days. Then another carpenter Jerry came to help Tom. They worke

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book Other Question
A. (A/G, 1.25%, 57) is not tabulated.
Find the value of A/G using the appropriate formula, not by interpolation.

B. What is the present worth of the following cash flows? how do youu solve a problem that only gives you the area and the ratio of the sides....and they ask you to find the perimeter