Solutions by everydaycalculation.com
1st number: 1 3/12, 2nd number: 12/18
1512 + 1218 is 2312.
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Related: 30/12+12/18 15/12+24/18 15/24+12/18 15/12+12/36 45/12+12/18 15/12+36/18 15/36+12/18 15/12+12/54 75/12+12/18 15/12+60/18 15/60+12/18 15/12+12/90 15/12+84/18 15/84+12/18
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