book Maths Puzzle Numerical Ability

George saves nickles and dimes for tolls. If he has 28 coins worth $2.60, how many are nickles and how many are dimes?

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book Other Question

Find the ninth term in the expansion of (3a-b)^12 I have absolutely no idea how to do this. Please help. If I know the length of two sides of a triangle, how do I find the length of the third side?