2017 · Q49
The ratio of two numbers is 1 : 5 and their product is 320. What is the difference between the squares of these two numbers ?
Elementary MathematicsRatio and Proportion
- A1024
- B1256
- C1536
- D1640
Explanation
Numbers x and 5x with 5x² = 320 give x = 8; the numbers are 8 and 40. Difference of squares: 1600 − 64 = 1536: option C.