Solutions by everydaycalculation.com
1st number: 5 1/3, 2nd number: 12/21
163 + 1221 is 12421.
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Related: 32/3+12/21 16/3+24/21 16/6+12/21 16/3+12/42 48/3+12/21 16/3+36/21 16/9+12/21 16/3+12/63 80/3+12/21 16/3+60/21 16/15+12/21 16/3+84/21 16/21+12/21
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