The product of two numbers is 120 and the sum of their squares is 289. What is the sum of the numbers?

Problem restatement
Let the numbers be a and b with ab = 120 and a² + b² = 289. Find a + b.

Concept/Approach
Use the identity (a + b)² = a² + b² + 2ab.

Step-by-step calculation
(a + b)² = 289 + 2×120 = 289 + 240 = 529 a + b = √529 = 23

Verification/Alternative
529 is 23². The sum could be −23 algebraically, but the context typically takes the positive sum.

Final Answer
23