Solutions by everydaycalculation.com
1st number: 1 14/21, 2nd number: 12/21
3521 + 1221 is 4721.
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Related: 70/21+12/21 35/21+24/21 35/42+12/21 35/21+12/42 35/21+36/21 35/63+12/21 35/21+12/63 35/21+60/21 35/21+84/21
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