book Maths Puzzle Numerical Ability

Juan has 15 pennies and 8 more nickles than dimes. He has 51 coins in all. How many dimes does he have?

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book Other Question

Please show me how to solve: (x/y)^3 / (x/2y)^3

(x/y) is a fraction and (x/2y) is a fraction

Thank you!!!!!!!!!!!
How do I Solve the equation by first clearing the fractions
Here's the problem:
5/6s+2/9=-7/12