Solutions by everydaycalculation.com
1st number: 1 8/10, 2nd number: 12/15
1810 - 1215 is 11.
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Related: 36/10-12/15 18/10-24/15 18/20-12/15 18/10-12/30 54/10-12/15 18/10-36/15 18/30-12/15 18/10-12/45 90/10-12/15 18/10-60/15 18/50-12/15 18/10-12/75 18/10-84/15 18/70-12/15
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