Solutions by everydaycalculation.com
1st number: 1 2/3, 2nd number: 12/21
53 + 1221 is 4721.
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Related: 10/3+12/21 5/3+24/21 5/6+12/21 5/3+12/42 15/3+12/21 5/3+36/21 5/9+12/21 5/3+12/63 25/3+12/21 5/3+60/21 5/15+12/21 35/3+12/21 5/3+84/21 5/21+12/21
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