Average Practice Question and Answer
8 Q: The average age of 30 students is 9 years. If the age of their teacher is included, the average age become 10 years. The age of the teacher ( in years ) is
1431 05f4f61a10c72eb234932c1ad
5f4f61a10c72eb234932c1ad- 134 yearsfalse
- 236 yearsfalse
- 337 yearsfalse
- 440 yearstrue
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Answer : 4. "40 years"
Q: The average of marks obtained by 14 students was 71, but it was found later that one of the student’s mark was accounted as 42 instead of 56 and for the other student; it was accounted as 74 instead of 32. So, the find the actual average? 1427 05d19df8b7619fe30b9d34a61
5d19df8b7619fe30b9d34a61- 167false
- 268false
- 369true
- 471false
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Answer : 3. "69"
Explanation :
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Q: A team of 8 persons joins in a shooting competition. The best marksman scored 85 points. If he had scored 92 points, the average score for the team would have been 84. The number of points the team scored was
1427 05ffd80ed605e8a6ae8f2a8b2
5ffd80ed605e8a6ae8f2a8b2- 1672false
- 2665true
- 3645false
- 4588false
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Answer : 2. "665"
Q: The average of marks obtained by 120 candidates in an examination is 35. The average of marks obtained by passed candidates is 39 and that of for failed candidates is 15. What is the no. of passed candidates? 1423 05d19d8bd1388cd24f0860f10
5d19d8bd1388cd24f0860f10- 1100true
- 2120false
- 3150false
- 4140false
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Answer : 1. "100"
Explanation :
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Q: The average weight of 15 oarsmen in a boat is increased by 1.6 kg when one of the crews, whose weighs 42 kg is replaced by a new man. Find the weight of the new man (in kg).
1387 05f479a3809e4377de945ee30
5f479a3809e4377de945ee30- 166true
- 243false
- 367false
- 465false
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Answer : 1. "66"
Q: Average age of a couple before 4 years, at the time of their marriage was 27 years. Now, the average age of the couple including their new born baby is 21 years. Find the present age of the baby? 1375 05d19d2be1388cd24f0860ef5
5d19d2be1388cd24f0860ef5- 14 yearsfalse
- 23 yearsfalse
- 32 yearsfalse
- 41 yearstrue
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Answer : 4. "1 years"
Q: The average of marks scored by the students of a class is 68. The average of marks of the girls in the class is 80 and that of the boys is 60. What is the percentage of boys in the class?
1364 05f2a5f24cef453383f1e38ad
5f2a5f24cef453383f1e38ad- 165%false
- 270%false
- 340%false
- 460%true
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Answer : 4. "60% "
Q: The average of seven numbers is 18. If one of the number is 17 and if it is replaced by 31, then the average becomes:
1364 05f2a7ddc7079852b553cc9c8
5f2a7ddc7079852b553cc9c8- 120true
- 221false
- 321.5false
- 419.5false
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