How do I solve this?

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.

5x + 2 = 12 solve the following equation. then place the correct number in the box provided.

Adozen bananas weigh 3 pounds how many ounces does 1 banana weigh