so, we know the mixture is the sum of both types of coffee, thus x + 20 = y, and 4x + 140 = 5y.
Children under 10 years and older people over 65 years receive a discount on movie tickets. Let x represent the age of a person
1 answer:
You might be interested in
so, we know the mixture is the sum of both types of coffee, thus x + 20 = y, and 4x + 140 = 5y.
