Elevator

The capacity of an elevator is either 20 children or 15 adults. If 12 children are currently in the elevator, how many adults can still get in?

Ducks and Cows

Farmer Brown had ducks and cows. One day she noticed that the animals had a total of 12 heads and 32 feet. How many of the animals were ducks and how many were cows?

Strange Number

If you take a particular two-digit number, reverse its digits to make a second two- digit number, and add these two number together, their sume will be 121. What is the original number?

Circle Round

The members of Mrs. Grant’s class are standing in a circle; they are evenly spaced and are numbered in order. The student with number 7 is standing directly across from the student with number 17. How many students are in the class?