Solutions by everydaycalculation.com
1st number: 2 2/3, 2nd number: 15/21
83 + 1521 is 7121.
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Related: 16/3+15/21 8/3+30/21 8/6+15/21 8/3+15/42 24/3+15/21 8/3+45/21 8/9+15/21 8/3+15/63 40/3+15/21 8/3+75/21 8/15+15/21 56/3+15/21 8/21+15/21
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