book Maths Puzzle Numerical Ability

i need help solving this equation: r(R1+R2)=R1R2,for R

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book Other Question

A variable z varies jointly with x and the square of y. If z = 6 when x = 4 and y = 3, write the equation of joint variation. Simplify:
x-y/x+2y times 2y+x/y+x divided by y-x/x+y