Solutions by everydaycalculation.com
1st number: 1 3/12, 2nd number: 5/21
1512 + 521 is 12584.
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Related: 30/12+5/21 15/12+10/21 15/24+5/21 15/12+5/42 45/12+5/21 15/12+15/21 15/36+5/21 15/12+5/63 75/12+5/21 15/12+25/21 15/60+5/21 15/12+35/21 15/84+5/21
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