Average
Practice problems on calculating averages, including weighted averages, averages of number sequences, and scenarios with group composition changes
Questions
In a school there are 5 classes. Class 1 has 45 students, class II has 38 students, class III has 42 students, class IV has 50 students and class V has 35 students. If new admission in class I and II are 9 and 16 respectively. Find the average number of students in each class for the new session.
- 42
- 47
- 37
- 58.75
- None of these
Find the average of the first 200 natural numbers.
- 200.5
- 101
- 10.05
- 100.5
- None of these
The average age of a family of 5 members is 38 years. After 3 years, the daughter left the family and a daughter-in-law joined the family. The new average age of the family is 39 years. What is the age difference between the daughter and daughter-in-law?
- 10
- 5
- 20
- 2
- None of these
Among 12 numbers, average of the first 4 numbers is 25, average of the next 4 numbers is 30 and average of the last 4 numbers is 35. What is the average of all 12 numbers?
- 30
- 7.5
- 22.5
- 90
- None of these
The average height of 4 boys is 160 cm. A boy of 139 cm height leaves the group. Find the new average height of the group
- 125.25 cm
- 167 cm
- 170 cm
- 155 cm
- None of these
If the average of 6 cosecutive odd numbers is m , then what will be the average of the next 6 consecutive odd numbers?
- Cannot be determined
- m + 6
- m + 12
- m + 2
- None of these
Find the average of the first 100 even natural numbers.
- 101
- 50.5
- 100
- 102
- None of these
Average age of a group is 28 years. A person aged 26 leaves the group and two persons of age 29 and 32 join the group. If the new average age of the group is 29, then how many members were in the group initialy?
- 5
- 6
- 7
- 8
- None of these
In a class of 20 students, 15 got 16 pencils each and 5 students got 20 pencils each. Find the average number of pencils a student got.
- 17
- 22
- 22.67
- 18
- None of these
A bike rider covers a distance of 80 km in 1 hour. He takes a 10 minutes break and again travels 40 km. If his average speed during the journey is 80 km/h, what is the speed in the second phase?
- 103 km/h
- 120 km/h
- 240 km/h
- 90 km/h
- None of these
If a sum is to be divided between A, B, C and D in ratio 3 : 6 : 5 : 10. If average money B and D got is rupees 160, then find the total amount.
- 480
- 240
- 640
- 4800
- None of these
Among five numbers, average of the first three is 47 and average of the last three is 58. What is the difference between the sum of last two numbers and the sum of first two numbers?
- 22
- 33
- 43
- 11
- None of these
The average age of a class of 25 students is 16. The average age of the class including a teacher is 18. What is the age of the teacher?
- 50
- 52
- 68
- 34
- None of these
In a class, 80% students got 14 candies and 20% students got 16 candies. What is the average number of candies a student got?
- 15.6
- 14.4
- 15
- 14
- None of these