Solutions by everydaycalculation.com
1st number: 1 3/21, 2nd number: 10/21
2421 + 1021 is 3421.
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Related: 48/21+10/21 24/21+20/21 24/42+10/21 24/21+10/42 72/21+10/21 24/21+30/21 24/63+10/21 24/21+10/63 24/21+50/21 24/21+70/21
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