exam Maths Puzzle Numerical Ability

please help to solve

x + 3y = 7
xy = 2

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exam Other Question

3x - 6 = 4x -18 Brazil nuts sell for $5 per pound and walnuts are sell for 3.50 per pound. How much of each type of nut would be needed to create 30 pounds of a mixture that would sell for $4 per pound?