seperate 144 into two groups so that one group will be 12 less than twice the other

Question

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Answer 1

n=first group

2n-12=second group

n+(2n-12)=144

3n-12=144

3n=144+12

3n=156

n=156/3

n=52

2*52-12=104-12=92

52 and 92 are the two groups