book Maths Puzzle Numerical Ability

Josiah has three less than twice as many nickles as dimes. If the total value of his coins was $1.45, how many of each coin did she have?

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book Other Question

Find the length of each side of the rectangle so that it has the given perimeter

Long side 2x - 5 short side x P= 50" Why must units of an expression be the same in order to be combined?