The sum of two numbers is 81, one of the numbers is 9 more than the other.What are the numbers?

Question

please help..thanks a lot

Answer 1

x + (x + 9) = 81

2x = 72

x = 36

x + 9 = 45

Answer 2

i think of 3 positive numbers. the greatest number is twice a perfect square. the least of them is 1 less than half the greatest number. the average of the 3 numbers is 12.