book Maths Puzzle Numerical Ability

This is the question: Jane has 132 more marbles than Mary has. If their mother gives 25 marbles to each of them, Jane will have 5 times as many marbles as Mary.How many marbles doe

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2a+3b+c/2d when a=2, b=0 c=3 and d=-5

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The revenue R for a jazz concert is given by the equation R=-1/500(x squared-5500x) where x is the number of tickets sold. Determine the number of tickets that will yield maximum