After 12years manoj Will be 3times as old As he was 4years ago find the present age.
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Answer 8
Let present age =x
•°• present age = 3x-4=x+12
=>3x-4=x+12
=>3x=x+12+4
=>3x=x+16
=>3x-x=16
=>2x=16
=>x=16÷2
=>x=8
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