Each child receives a meal which consists of a hamburger, a bag of pretzels, and a drink for the children ages 6-10 and a hamburger , two bags of pretzels, and a drink for the children that are older than 10. it costs the club 80 cents for each hamburger, 35 cents for each bag of pretzels, and 60 cents for each drink. calculate the cost to feed each age group

Since there isn't a given amount of children for both age groups you can represent each group by a variable:

Let variable (a) stand for the number of children ages 6-10.

Let variable (b) stand for the number of children ages 10 and older.

For one child of age 6-10, the total of the sum of the costs of each food item given to him or her would be $1.75

For one child of age 10 or older, the total of the sum of the costs of each food item given to him or her would be $2.10

The total cost to feed children 6-10 can be represented as an equation:
Total cost = 1.75a

The total cost to feed children 10 or older represented as an equation would be:
Total cost = 2.1b

And if you were to find the two total costs of both groups combined the equation would look like this:
Total cost = 1.75a + 2.1b