Solutions by everydaycalculation.com
1st number: 1 9/15, 2nd number: 1 6/15
2415 - 2115 is 15.
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Related: 48/15-21/15 24/15-42/15 24/30-21/15 24/15-21/30 72/15-21/15 24/15-63/15 24/45-21/15 24/15-21/45 24/75-21/15 24/15-21/75
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