Solutions by everydaycalculation.com
1st number: 1 14/21, 2nd number: 5/21
3521 + 521 is 4021.
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Related: 70/21+5/21 35/21+10/21 35/42+5/21 35/21+5/42 35/21+15/21 35/63+5/21 35/21+5/63 35/21+25/21 35/21+35/21
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