Solutions by everydaycalculation.com
1st number: 5 1/3, 2nd number: 2 4/6
163 + 166 is 81.
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Related: 32/3+16/6 16/3+32/6 16/6+16/6 16/3+16/12 48/3+16/6 16/3+48/6 16/9+16/6 16/3+16/18 80/3+16/6 16/3+80/6 16/15+16/6 16/3+16/30 16/21+16/6 16/3+16/42
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