INTEGER REAL-WORLD PROBLEMS I DONT KNOW HOW TO DO THIS PLEASE I WILL GIVE BRAINILEST

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.

One integer is 8 times another. if the product is 72, then find the integers

How do you determine if an ordered pair is a solution to a given equation?