It is 35
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30% of 40 is 12 which is a whole number, not a fraction.
31 and 37 are the only prime numbers between 30 and 40.
37 is a prime number between 30 and 40.
40
Any number between 30 and 40 can be a factor. The common factors of 30 and 40 are 1, 2, 5 and 10.