exam Maths Puzzle Numerical Ability

Can someone please help me with this I have to write this fraction in simplest form

-15x^3 y^3/-20xy^4

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exam Other Question

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29+(-42)+510+(-397)+52(-792)
Help me please. I do not understand am i supposed to subtract all the ones in parenthisis then add the rest, then subtract the total parenthisis from the total of the ones not in parenthesis?
An open rectangular gutter is made by turning up the sides of a piece of metal 20 in. wide. The area of the cross-section of the gutter is 50 in.^2. Find the depth of the gutter.