Solutions by everydaycalculation.com
1st number: 1 2/3, 2nd number: 5/21
53 + 521 is 4021.
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Related: 10/3+5/21 5/3+10/21 5/6+5/21 5/3+5/42 15/3+5/21 5/3+15/21 5/9+5/21 5/3+5/63 25/3+5/21 5/3+25/21 5/15+5/21 35/3+5/21 5/3+35/21 5/21+5/21
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