X/31
where X is the number
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31 is a prime number so it can only be divided by 1 and 31.
To work it out for yourself, you need to understand that a prime number is a number than can only be divided by 1 and itself. 18 can be divided by 2 39 can be divided by 3 42 can be divided by 2 which leaves 31 which can only be divided by 1 and 31.
XXXI is the number 31 in Roman numerals.
47.4444
31 over 16 as a mixed number = 115/16