Each class at briarwood elementary collected at least 54 cans of food during the food drive if there are 29 classes in the school what was the least number of cans collected?

The answer to this question would be: at least 1566 can of food
In this question, each class at Briarwood Elementary collect at least 54 can of food and there are 29 classes. From that description you can get this equation:

1 class = 54 can of foods

Then for 29 class, the number of the can of food would be:
29 class * (54 can/class)= at least 1566 can of food