Question

the lunch choices last friday were mushroom or pepperoni pizza. the cafeteria made 70 pizzas in all, 90% of which were mushroom pizzas. how many mushroom pizzas did the cafeteria make?

□ mushroom pizzas

Explanation:

Step1: Convert percentage to decimal

To find 90% of 70, we first convert 90% to a decimal. 90% is equal to $0.9$ (since percent means "per hundred", so 90% = $\frac{90}{100}=0.9$).

Step2: Multiply the total number of pizzas by the decimal

We multiply the total number of pizzas (70) by the decimal form of the percentage (0.9). So the calculation is $70\times0.9$.
Calculating $70\times0.9 = 63$.

Answer:

63