Solutions by everydaycalculation.com
1st number: 1 2/10, 2nd number: 12/15
1210 + 1215 is 21.
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Related: 24/10+12/15 12/10+24/15 12/20+12/15 12/10+12/30 36/10+12/15 12/10+36/15 12/30+12/15 12/10+12/45 60/10+12/15 12/10+60/15 12/50+12/15 12/10+12/75 84/10+12/15 12/10+84/15 12/70+12/15
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