Solutions by everydaycalculation.com
1st number: 1 3/15, 2nd number: 4 12/15
1815 + 7215 is 61.
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Related: 36/15+72/15 18/30+72/15 18/15+72/30 54/15+72/15 18/45+72/15 18/15+72/45 90/15+72/15 18/75+72/15 18/15+72/75
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