Solutions by everydaycalculation.com
1st number: 1 4/8, 2nd number: 6/12
128 + 612 is 21.
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Related: 24/8+6/12 12/16+6/12 12/8+6/24 36/8+6/12 12/8+18/12 12/24+6/12 12/8+6/36 60/8+6/12 12/8+30/12 12/40+6/12 12/8+6/60 84/8+6/12 12/8+42/12 12/56+6/12 12/8+6/84
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