Average Practice Test 1

Question : 33 of 40

Marks: +1, -0

The average age of a group of 40 students in a bus is 7 years. When the conductor’s age is included, the average age is increased by one year. The age of the conductor is:

40 years
45 years
48 years
None of these

Validate

Solution:

Average age of a group of 40 students = 7 years
Total age of students = 40 × 7 = 280 years
According to the statement,
When the age of the conductor is included, the average will be increased by one year.
Total age of the students and the conductor = 280 + x
The age of the conductor

={280+x}/41=8

x = 328 - 280

x = 48

years

Go to Question:

Prev Question

Next Question