What is the ratio 15 to 40 in simplest form

Twenty-five percent of the customers entering a grocery store between 5 p.m. and 7 p.m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

Which statement about the annual percentage rate (apr) is not true?

Using elimination, what is -4x+2y=-12 4x+8y=-24