Solutions by everydaycalculation.com
1st number: 2 0/15, 2nd number: 2 10/15
3015 - 4015 is -23.
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Related: 60/15-40/15 30/15-80/15 30/15-40/30 90/15-40/15 30/45-40/15 30/15-40/45 30/75-40/15 30/15-40/75
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