Solutions by everydaycalculation.com
1st number: 1 3/12, 2nd number: 9/12
1512 - 912 is 12.
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Related: 30/12-9/12 15/12-18/12 15/24-9/12 15/12-9/24 45/12-9/12 15/12-27/12 15/36-9/12 15/12-9/36 75/12-9/12 15/12-45/12 15/60-9/12 15/12-9/60 15/12-63/12 15/84-9/12 15/12-9/84
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