Solutions by everydaycalculation.com
1st number: 18/21, 2nd number: 2 8/21
1821 + 5021 is 6821.
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Related: 36/21+50/21 18/42+50/21 18/21+50/42 54/21+50/21 18/63+50/21 18/21+50/63 90/21+50/21
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