Solutions by everydaycalculation.com
1st number: 2/8, 2nd number: 1 9/12
28 + 2112 is 21.
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Related: 4/8+21/12 2/8+42/12 2/16+21/12 2/8+21/24 6/8+21/12 2/8+63/12 2/24+21/12 2/8+21/36 10/8+21/12 2/40+21/12 2/8+21/60 14/8+21/12 2/56+21/12 2/8+21/84
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