or
or
If karim's age is x , then Rahim's age will be 3x.
According to question, 3x = 12
or, x = 4
After y years, Rahim's age will be doubled than karim.
12 + y = 2(4 + y)
∴y = 4
At the time, Rahim's age = 3x + y = 3*4 + 4 = 16
ans: 16 yrs
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