Is an 8oz. bag for 0.64 cents or a 20oz. bag of cheetos for $1.28 a better deal?

In order to find which one is a better deal, we need to find the cost per unit.  The way to find this is take the cost and divide it by the number of units.  Our single unit in this case is an ounce, so we will find cost per ounce.

The 8 oz bag:

8 Cents Per Ounce

The 20 oz bag:

6.4cents per ounce

So, the 20 ounce bag is a better deal since its cost per ounce is less.

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40