You must sell at least 25 water bottles to earn back the money spent on water.
An equation is an expression that shows the relationship between two or more variables and numbers.
Let x represent the number of bottles sold.
To earn back the money spent on water:
2x ≥ 50
x ≥ 25
You must sell at least 25 water bottles to earn back the money spent on water.
Find out more on equation at: https://brainly.com/question/1214333