Solutions by everydaycalculation.com
1st number: 18/21, 2nd number: 1 14/21
1821 + 3521 is 5321.
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Related: 36/21+35/21 18/21+70/21 18/42+35/21 18/21+35/42 54/21+35/21 18/63+35/21 18/21+35/63 90/21+35/21
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