Solutions by everydaycalculation.com
1st number: 4/21, 2nd number: 1 3/21
421 + 2421 is 43.
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Related: 8/21+24/21 4/21+48/21 4/42+24/21 4/21+24/42 12/21+24/21 4/21+72/21 4/63+24/21 4/21+24/63 20/21+24/21 28/21+24/21
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