Solutions by everydaycalculation.com
1st number: 1 6/12, 2nd number: 8/16
1812 + 816 is 21.
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Related: 36/12+8/16 18/24+8/16 18/12+8/32 54/12+8/16 18/12+24/16 18/36+8/16 18/12+8/48 90/12+8/16 18/12+40/16 18/60+8/16 18/12+8/80 18/12+56/16 18/84+8/16
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