Use reasoning to lead to the answer of the following question:
Each yogurt is topped with 8 banana slices. One banana will yield 10 slices. If Vivian needs to make 5 yogurts, how many bananas does she need to buy?

4
To make the yogurts, Vivian needs 5 x 8 = 40 banana slices.

She needs to buy 40 / 10 = 4 bananas.

.

Therefore, the answer is 4