31 - 15 = 16. There for 15 is 16 less than 31.
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It is greater. 7x15=105 31+30+31= 92
It's 31 feet less than 1 mile
The prime numbers that are greater than 31 but less than 50 are: 37, 41, 43 and 47.
31
6x - 6 < 31 6x < 37 x < 37/6