book Maths Puzzle Numerical Ability

A purse contains $8.35 in quarters and dimes. There are 4 more quarters than dimes. Find the number of quarters and dimes.

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book Other Question

construct a 3x3 non zero matrix A such that the vector [1 -2 1] (vertical column not horizontal) is a solution of Ax=0 (2/x) / (3x/4)= x/8
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