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Earlier discussion
1 older comment kept for context.
Classic Timmy Josh
Brother's age is 10
Sister's age is 4
Number of years he will be twice as old as his sister is x + (twice his sister's age) equals to his present age
:. x + (2 × 4) = 10
:. x + 8 = 10
:. x = 10 - 8
:. x = 2
There the years will 2 years