Solutions by everydaycalculation.com
1st number: 18/27, 2nd number: 1 9/27
1827 + 3627 is 21.
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Related: 36/27+36/27 18/27+72/27 18/54+36/27 18/27+36/54 54/27+36/27 18/81+36/27 18/27+36/81 90/27+36/27
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