Solutions by everydaycalculation.com
1st number: 3/15, 2nd number: 1 8/10
315 + 1810 is 21.
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Related: 6/15+18/10 3/15+36/10 3/30+18/10 3/15+18/20 9/15+18/10 3/15+54/10 3/45+18/10 3/15+18/30 3/15+90/10 3/75+18/10 3/15+18/50 21/15+18/10 3/15+18/70
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