Anytime your top number is bigger then your bottom number, it can be simplified. So 31/18 = 1 R 13, so you would write that as 1 and 13 over 18.
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31/42 is already simplified
That is as simplified as it can be, so the answer is 31/44
31 is a prime number, so you cant divide it. 31 over 20 is already simplified.
87/18 = 29/6 when simplified
109/18 cannot be simplified further.