Question

Eleven members of the Middle School Math Club each paid the same amount for a guest speaker to talk about problem solving at their math club meeting. They paid their guest speaker $1 − A − 2 − . What is the missing digit A of this 3 -digit number?

Answer 1

You know the number has to be divisible by 11. You also know the number is between 100 and 200.

You can list the multiples of 11 in this interval.

110, 121, 132...

You have your answer. The total price is 132 dollars, and the missing digit is 3.