exam Maths Puzzle Numerical Ability

Solve the formula:

P=A/1+ar solve for r

Solve the equation:

1/x-2 - 1/x+2 = 1/15

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exam Other Question
How would I simplify the following...

(8x^3y^2z^2)*3x^2 over y^3x^4

Thanks! 4x - 6 = 34