Solutions by everydaycalculation.com
1st number: 1 9/21, 2nd number: 8/21
3021 + 821 is 3821.
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Related: 60/21+8/21 30/21+16/21 30/42+8/21 30/21+8/42 90/21+8/21 30/21+24/21 30/63+8/21 30/21+8/63 30/21+40/21 30/21+56/21
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