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

an open topped box has a square base (bottom)and a height of 7cm. if the surface area of the five sides of the box is 165cm squared, find the dimensionsof the square base? what is the lateral and surface area of a regular pyramid with legs the equal 5 and a one base side that equals 6