Question

The average age of seven persons sitting in a row facing north is 56 years. If the average age of the first three-person is 50 years and the average age of the last three persons is 55 years, then the age of the person sitting middle of the row?
1. 77
2. 66
3. 55
4. 44

Answer 1

Correct Answer - Option 1 : 77

Given:

The average age of seven-person is 56 years

Calculation:

⇒ The total sum of age of first three-person = 3 × 50 = 150

⇒ The total sum of age of last three-person = 55 × 3 = 165

⇒ The total age of all seven persons = 7 × 56 = 392

⇒ The age of middle person = 392 - 150 - 165 = 77

∴ The required result will be 77.