Question

the difference between the ages of Rahul and Ravi is 9 years after 10 years Rahul will be twice as old as what Ravi was 10 years ago find their present ages

Answer 1

let age of Rahul be x and that of Ravi be y
$x - y = 9 \\( x + 10) = 2(y - 10) \\ 2y - x = 30 \\ adding \: first \: and \: third \: equation \: we \: get \\ y = 39 \: and \: x = 48$
Present ages are 39 and 48.
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