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Answer:
His present age is 8
Explanation:
Step 1: Let x represent Manoj's present age
Step 2: 12=3(x-4), 12=3x - 12, 12+12=3x
24=3x , 3x÷3,24÷3
then 3 cancells 3 leaving x.
then 3 goes into 24, 8 times.
therefore his present age is 8
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