Nine friends are going to equally share some muffins. Each muffin is the same size. Each friend gets one and one-third muffins. How many muffins did the nine friends equally share?

9 * 4/3 = ___

To find the number of muffins that the nine friends equally shared, you first need to calculate how many muffins one friend would receive.

Given that each friend gets one and one-third muffins, you can think of it as 4/3 of a muffin (since 1 and 1/3 is the same as 4/3).

Now, you can multiply this fraction (4/3) by the number of friends (9) to calculate the total number of muffins:

(4/3) × 9 = 36/3 = 12

Therefore, the nine friends equally shared 12 muffins.