Solutions by everydaycalculation.com
1st number: 8/12, 2nd number: 1 6/18
812 + 2418 is 21.
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Related: 16/12+24/18 8/12+48/18 8/24+24/18 8/12+24/36 24/12+24/18 8/12+72/18 8/36+24/18 8/12+24/54 40/12+24/18 8/60+24/18 8/12+24/90 56/12+24/18 8/84+24/18
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