Solutions by everydaycalculation.com
1st number: 15/20, 2nd number: 1 3/12
1520 + 1512 is 21.
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Related: 30/20+15/12 15/20+30/12 15/40+15/12 15/20+15/24 45/20+15/12 15/20+45/12 15/60+15/12 15/20+15/36 75/20+15/12 15/20+75/12 15/20+15/60 15/20+15/84
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