2:3
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Find the GCF of the two numbers and divide them both by it. If the GCF is 1, the ratio is in its simplest form.
Use a formula or algorithm for finding the greatest common factor. When in their simplest form, the numbers in a ratio have a GCF of 1. this is often easy to spot without formally checking; for instance, if any of the numbers are prime, then they are in their simplest ratio.
Prime numbers are used to find the product of the prime factors of composite numbers.
These are prime numbers of the form p and p+2.
It is: 6 to 5