1. The average weight of 25 students is 40 kg. What is the total weight of all students?
- A900 kg
- B950 kg
- C1000 kg
- D1050 kg
Show answer
Answer: C
Total=Average×Number=40×25=1000 kg.
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Average — Mathematics Questions & Practice
Practise 50 Average questions from Mathematics for competitive exams such as UPSC, Banking, SSC and Railway. Read the worked questions below, check every answer with an explanation, and track what you get wrong.
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Practice questions on Average — with answers
Try each question first, then open the answer. Explanations are included.
2. Find the average of the first 10 even natural numbers.
- A10
- B11
- C12
- D13
Show answer
Answer: B
First 10 even numbers: 2 to 20. Sum=110. Average=110/10=11.
3. Find the average of the first 15 odd natural numbers.
- A13
- B14
- C15
- D16
Show answer
Answer: C
First 15 odd numbers: 1 to 29. Sum=225. Average=225/15=15.
4. The average age of 30 students in a class is 12 years. If the teacher's age is included, the average becomes 13 years. What is the teacher's age?
- A40 years
- B42 years
- C43 years
- D45 years
Show answer
Answer: C
Total age of students=30×12=360. New total for 31 people=31×13=403. Teacher's age=403-360=43.
5. The average weight of 8 people increases by 2 kg when a person weighing 35 kg is replaced by a new person. What is the weight of the new person?
- A47 kg
- B49 kg
- C51 kg
- D53 kg
Show answer
Answer: C
Total increase=8×2=16 kg. New person's weight=35+16=51 kg.
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