Solutions by everydaycalculation.com
1st number: 2 10/15, 2nd number: 10/15
4015 - 1015 is 21.
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Related: 80/15-10/15 40/15-20/15 40/30-10/15 40/15-10/30 40/15-30/15 40/45-10/15 40/15-10/45 40/15-50/15 40/75-10/15 40/15-10/75 40/15-70/15
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