It is 11/15.
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make the lower number the same 8/15 = 32/60 11/20 = 33/60 so 11/20 is bigger
7/8 is bigger than 13/15 7/8 = 105/120 13/15= 104/120 thus, 7/8 is bigger than 13/15
1 is a common factor of 11, 12, 13, 14 and 15.
5/13 ÷ 15/26 = 2/3
2 over 15 3/5 x 3/3 = 9/15 11/15 - 9/15 = 2/15