Chapter 2 - Solving Equations - 2-2 Solving Two-Step Equations - Practice and Problem-Solving Exercises - Page 91: 24

3 bottles of olive oil

If you have 16 dollars and a 5 dollar coupon, you can spend 21 dollars because $16 + 5 = 2.$ If each bottle of olive oil costs 7 dollars, and the number of bottles you can buy is 'x' you can set up the equation $21 = x\times7$ If you divide each side by 7 you get $x = 3$