exam Maths Puzzle Numerical Ability

Solve the following 2 x 2 systems using substitutions

2x + 3y = 68
5x + 4y =128

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exam Other Question

What percent of 65 is 13? im stuck on these 2 problems. thanks for your help.

divide and if possible simplify.

problem 1 3y+15/y^7 / y+5/y^2

problem 2 x^2-y^2/4x+4y / 3y-3x/12x^2