Question

Arun is 5 years younger than Rahul 4 years later Rahul will be twice as old as Arun find their present ages

Answer 1

$let \: arun \: age \: be \: x \\ rahul \: age =x + 5\\ and \\ four \: year \:later \\ arun = x + 4 \\ and \: rahul = x + 5 + 4 \\ = x + 9\\ according \: to \: question \\ rahul \: age \: = 2(arun \: age) \\ x + 9 = 2(x + 4) \\ x + 9 = 2x + 8 \\ 2x + 8 - x - 9 = 0\\ x - 1 = 0 \\ x = 1 \\ arun \: age = 1year \\ and \: rahul \: age =x + 5 \\ = 6years$
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