book Maths Puzzle Numerical Ability

Thanks for your help sir.

The present age of A and B is in the ratio of 9:7. After 10 years, it would be in the ratio of 7:5. Find their present ages

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book Other Question

Write and slove an equation to find 3 consecutive integers such that the sum of the first and the third is three times the second. Hi!
I tried to solve this problem but my answer came out in the form of a fraction. I think I am doing it the wrong way. Please show me how to solve this system using substitution