Solutions by everydaycalculation.com
1st number: 1 3/15, 2nd number: 1 8/10
1815 + 1810 is 31.
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Related: 36/15+18/10 18/15+36/10 18/30+18/10 18/15+18/20 54/15+18/10 18/15+54/10 18/45+18/10 18/15+18/30 90/15+18/10 18/15+90/10 18/75+18/10 18/15+18/50 18/15+18/70
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