5 is a prime number while 9 & 8 are compositenumbers.
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All those numbers are mutually prime (5 and 7 are prime, full stop), so the least common denominator is 5x7x8x9.
The prime numbers (factors) of 75 are: 3 and 5
5,1
5. And primes must be integers.
Prime numbers are: 2 3 5 7 Composite numbers are: 4 6 8 9 10 So the ratio is: 4 to 5