Solutions by everydaycalculation.com
1st number: 1 2/10, 2nd number: 1 5/10
1210 - 1510 is -310.
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Related: 24/10-15/10 12/10-30/10 12/20-15/10 12/10-15/20 36/10-15/10 12/10-45/10 12/30-15/10 12/10-15/30 60/10-15/10 12/10-75/10 12/50-15/10 12/10-15/50 84/10-15/10 12/70-15/10 12/10-15/70
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