book Maths Puzzle Numerical Ability

Roz is twice as old as Grace. In 5 years the sum of their ages will be 28. How old are they now?

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book Other Question
a^2-9ab+81b^2 Solve for "x"

x^2/3=x/5

I tried to solve but it doesnt check:

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