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12/15 is bigger than 4/10 or 4/5 is bigger than 2/5
1/5 is the same as 2/10, so, yes, 3/10 is bigger than 1/5.
No, it's half the size.
No. 4/10 is 60% bigger than 1/4 .
3 over 5 is the smallest. Therefore 7 over 10, 13 over 20 and 17 over 30 are all bigger than 3 over 5.