Question

Barbara sells iced tea for $1.49 per bottle and water for $1.25 per bottle. She wrote an equation to find the number of bottles she needs to sell to earn $100.

1.25x + 1.49 = 100
What error did Barbara make in writing the equation?

Barbara’s equation did not consider the number of bottles of water.
Barbara’s equation did not consider the number of bottles of iced tea.
Barbara’s equation did not use the correct price for the bottles of iced tea.
Barbara's equation did not use the correct total for sales.

Answer 1

Barbara’s equation did not consider the number of bottles of iced tea.

Explanation: 1.25x + 1.49 = 100 treats the iced tea as a single bottle (1.49) instead of using a variable for how many iced teas are sold. The correct form would be 1.25x + 1.49y = 100.