Solutions by everydaycalculation.com
1st number: 1 1/15, 2nd number: 18/21
1615 - 1821 is 22105.
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Related: 32/15-18/21 16/15-36/21 16/30-18/21 16/15-18/42 48/15-18/21 16/15-54/21 16/45-18/21 16/15-18/63 80/15-18/21 16/15-90/21 16/75-18/21
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