Shelley's Cafe has regular coffee and decaffeinated coffee. This morning, the cafe served 40 coffees in all, 90% of which were regular. How many regular coffees did the cafe serve?

Answer 1

To find the number of regular coffees served at Shelley's Cafe, we start with the total number of coffees served, which is 40. We know that 90% of these were regular coffees.

We can calculate the number of regular coffees by taking 90% of 40:

\[ \text{Number of regular coffees} = 90% \times 40 \]

Converting 90% to a decimal gives us 0.9. Therefore, we can perform the calculation:

\[ \text{Number of regular coffees} = 0.9 \times 40 \]

Now, we multiply:

\[ 0.9 \times 40 = 36 \]

Thus, the number of regular coffees served by the cafe is \( \boxed{36} \).