exam Maths Puzzle Numerical Ability

In five years time a father will be three times as old as his son. Five years ago, the father was six times as old as his son. Find their present age.

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exam Other Question
By looking at a triangle, how can you tell if a triangle is an isosceles or not? Can you please help? I need to solve this problem:

(1/2) + (x/6) = (18/x)

thanks