Solutions by everydaycalculation.com
1st number: 1 3/15, 2nd number: 1 5/10
1815 - 1510 is -310.
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Related: 36/15-15/10 18/15-30/10 18/30-15/10 18/15-15/20 54/15-15/10 18/15-45/10 18/45-15/10 18/15-15/30 90/15-15/10 18/15-75/10 18/75-15/10 18/15-15/50 18/15-15/70
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