Solutions by everydaycalculation.com
1st number: 15/21, 2nd number: 3 3/6
1521 is smaller than 216
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Related: 30/21 and 21/6 15/21 and 42/6 15/42 and 21/6 15/21 and 21/12 45/21 and 21/6 15/21 and 63/6 15/63 and 21/6 15/21 and 21/18 75/21 and 21/6 15/21 and 21/30 15/21 and 21/42
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