book Maths Puzzle Numerical Ability

Solve for "x"

x^2/3=x/5

I tried to solve but it doesnt check:

x^2/3=x/5
5x^2=3x
?

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book Other Question

Roz is twice as old as Grace. In 5 years the sum of their ages will be 28. How old are they now? Please show how to do this problem

3x+6=2x-5 and

8x-6=-4+3

Thanks J