Total Number of Snacks Sold at the Bake Sale

During a school event, students counted the number of different snacks sold at the bake sale. They created a bar graph to illustrate their findings. The graph showed the following number of snacks sold:

Cupcakes: 40

Cookies: 30

Brownies: 20

Donuts: 15

The students want to know which snack was the most popular. Using the bar graph data, what is the total number of snacks sold?