Solutions by everydaycalculation.com
1st number: 1 4/12, 2nd number: 15/18
1612 - 1518 is 12.
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Related: 32/12-15/18 16/12-30/18 16/24-15/18 16/12-15/36 48/12-15/18 16/12-45/18 16/36-15/18 16/12-15/54 80/12-15/18 16/12-75/18 16/60-15/18 16/12-15/90 16/84-15/18
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