InterviewSolution
Saved Bookmarks
| 1. |
1). 52). 73). 114). 15 |
|
Answer» Let, the number he added twice = X Sum of all natural NUMBERS from 1 to 20, ⇒ 20 × (20 + 1)/2 ⇒ 10 × 21 ⇒ 210 According to problem, ⇒ 210 + x = 215 ⇒ x = 5 |
|