exam Maths Puzzle Numerical Ability

x-3y=0
xy=27

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write a formula to solve:
you have $6.70 in quarters and dimes, a total of 46 coins, how many quarters and how many dimes The perimeter of a cross section of a "two-by-four" piece of lumber is 10 and 1/2in. The length is twice the width. Find the actual dimensions of the cross section of a two-by-four.