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10 out of10 19 out of 20 39 fortieths
9/20
9/10 minus 9/15 is 3/10
9/10 of 3 = 2.7
three tenths is greater. The least common denominator is 30: 3/10 = 9/30 and 4/15 = 8/30. 9 > 8 so 9/30 > 8/30 and 3/10 > 4/15