Find the next number in the series: 5, 15, 45, 135, ?
- A. 390
- B. 420
- C. 375
- D. 405 ✓
Correct answer
D. 405
Explanation
Each number is multiplied by 3, so the next number is 135 x 3 = 405.
D. 405
Each number is multiplied by 3, so the next number is 135 x 3 = 405.