Solutions by everydaycalculation.com
1st number: 1 6/12, 2nd number: 2/4
1812 + 24 is 21.
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Related: 36/12+2/4 18/24+2/4 18/12+2/8 54/12+2/4 18/12+6/4 18/36+2/4 18/12+2/12 90/12+2/4 18/12+10/4 18/60+2/4 18/12+2/20 18/12+14/4 18/84+2/4 18/12+2/28
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