exam Maths Puzzle Numerical Ability

I need help evaluating the expression
x^2/y+x^2/z for x=10,y=-5, and z=-2

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exam Other Question

In a design the ratio of grey to black is 3:1

what percentage of the design is black? Leah is 6 years older than her sister Suzan, and Jon is 5 years older than Leah, the total age average is 41. So how old is sue.