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Maths Puzzle
Numerical Ability
construct a 3x3 non zero matrix A such that the vector [1 -2 1] (vertical column not horizontal) is a solution of Ax=0
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WRITE IN DECIMAL FORM
0.8%=?
A purse contains $8.35 in quarters and dimes. There are 4 more quarters than dimes. Find the number of quarters and dimes.