Solutions by everydaycalculation.com
1st number: 1 2/4, 2nd number: 6/12
64 + 612 is 21.
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Related: 12/4+6/12 6/8+6/12 6/4+6/24 18/4+6/12 6/4+18/12 6/12+6/12 6/4+6/36 30/4+6/12 6/4+30/12 6/20+6/12 6/4+6/60 42/4+6/12 6/4+42/12 6/28+6/12 6/4+6/84
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