A mean ogre stole 27 of your muffins. That was 3/5 of all of them! With how many did you start?

First divide 27 by 3 to find out how many muffins you had per 1/5

27/3

9

You then multiply this by 5 to figure out how many you had total

9x5

45

You started out with 45 muffins total, that was a mean ogre to steal over half of them!