exam Maths Puzzle Numerical Ability

I am trying to solve problem 10 on page 419. I do not understand how to find the base, when the area is already given in a triangle

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exam Other Question

simplify completely. 5w^2/3rs/20wr/s^2.. i got ws/12r^2 .. is that correct one number is four times another number. The larger number is also 87 more than the smaller number. find the numbers. choices for smaller number: 29, 30, 33