Solutions by everydaycalculation.com
1st number: 2 4/6, 2nd number: 10/15
166 - 1015 is 21.
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Related: 32/6-10/15 16/6-20/15 16/12-10/15 16/6-10/30 48/6-10/15 16/6-30/15 16/18-10/15 16/6-10/45 80/6-10/15 16/6-50/15 16/30-10/15 16/6-10/75 16/6-70/15 16/42-10/15
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