21.5
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11/15= 11 ÷ 15= 0.73313/20= 13 ÷ 20= 0.65therefore 11/15 is bigger than 13/20.
15
2/15 = 8/60 3/20 = 9/60 so 3/20 is bigger.
8/15 or11/20 160/300=8/15 165/300 =11/20 so 11/20 is bigger
3/4 = 15/20 3/5 = 12/20 Therefore 3/4 is more than 3/5.