Solutions by everydaycalculation.com
1st number: 5 1/3, 2nd number: 5/7
163 + 57 is 12721.
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Related: 32/3+5/7 16/3+10/7 16/6+5/7 16/3+5/14 48/3+5/7 16/3+15/7 16/9+5/7 16/3+5/21 80/3+5/7 16/3+25/7 16/15+5/7 16/3+5/35 16/3+35/7 16/21+5/7 16/3+5/49
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