which number can divide both 43 and 57 without leaving a remainder?

Question

A number that can divide 43 and 57 and leave no remainder. Ultimately I

want to find the ratio of the two numbers.

Answer 1

43 is a prime number, i.e. not divisible except by itself and 1.

19 & 3 are the factors of 57.

Therefore, except for 1, there are no common divisors of 57 and 43.