| Question | The average age of 17 persons is 39 years. If the average age of the first 9 persons is 35 years, and the average age of the last 9 persons is 44 years, what is the age of the 9th person? | |
| Type | multiple_choice | |
| Option | 45 years | incorrect |
| Option | 36 years | incorrect |
| Option | 48 years | correct |
| Option | 41 years | incorrect |
| Solution | Required Age of 9th person = 9 x 44 + 9 x 35 – 17 x 39 = 48 2nd method Required age = 9( -4 ) + 9( 5 ) + 39 = 48 | |
