Solutions by everydaycalculation.com
1st number: 10/15, 2nd number: 1 2/6
1015 + 86 is 21.
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Related: 20/15+8/6 10/15+16/6 10/30+8/6 10/15+8/12 30/15+8/6 10/15+24/6 10/45+8/6 10/15+8/18 50/15+8/6 10/15+40/6 10/75+8/6 10/15+8/30 70/15+8/6 10/15+56/6 10/15+8/42
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