book Maths Puzzle Numerical Ability

How do you solve this problem;

ab divided by c = d.

and

a+a times c = to d

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book Other Question

Solve each compound inequality and write the solution set using interval notation.



a) 3<5x/2 +4 is less than or equal to 12 AND 2x > 3x/2 +1/8


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