Solutions by everydaycalculation.com
1st number: 1 3/12, 2nd number: 15/18
1512 - 1518 is 512.
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Related: 30/12-15/18 15/12-30/18 15/24-15/18 15/12-15/36 45/12-15/18 15/12-45/18 15/36-15/18 15/12-15/54 75/12-15/18 15/12-75/18 15/60-15/18 15/12-15/90 15/84-15/18
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