Question

Challenge 1:

The sum of two numbers is 20, and the difference between their squares is 40. Find the numbers.
Challenge 2:
What is the number?
It is greater than 15 squared. It is not a multiple of 3 or 5, but a multiple of 4. It is less than 20
squared. It is not a multiple of 17. It is a square number.

Answer 1

11+9=20

(11)^2-(9)^2=40

121-81=40

40=40