Average based Mathematics Quiz For CTET Exam : 20th Feb 2020_00.1
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Average based Mathematics Quiz For CTET Exam : 20th Feb 2020

Average based Mathematics Quiz For CTET Exam : 20th Feb 2020_40.1

Q1. A girl bought 15 pens at Rs 5 each, 20 pens at Rs 10 each and 10 pens at Rs 15 each. Find the average price of pens?
एक लड़की ने 5 रुपये प्रति पेन की कीमत से 15 पेन, 10 रुपये प्रति पेन की कीमत से 20 पेन और 15 रुपये प्रति पेन की कीमत से 10 पेन खरीदे। पेन की औसत कीमत ज्ञात कीजिये?
(a) 10
(b) 9.44
(c) 10.44
(d) 9

Q2. The average of 25 students score is 15. It was later found that a student’s marks 55 was wrongly entered as 45. The new average is
25 छात्रों के औसत अंक 15 हैं। बाद में पाया गया कि एक छात्र के 55 अंकों को गलती से 45 दर्ज कर दिया गया था। नया औसत होगा:
(a) 14.4
(b) 14
(c) 15
(d) 15.4

Q3. The average of 16 observation is 26. One more observation is included and the new average become 27. Find the 17th observation?
16 टिप्पणियों का औसत 26 है। एक और टिप्पणी शामिल करके नया औसत 27 हो गया। 17वीं टिप्पणी ज्ञात करें?
(a) 43
(b) 40
(c) 44
(d) 47

Q4. If the average of 6 even consecutive numbers is 27. Find the largest number
यदि 6 सम अनुगामी संख्याओं का औसत 27 है. तो सबसे बड़ी संख्या ज्ञात कीजिए
(a) 22
(b) 24
(c) 32
(d) 26

Q5. Find the average of 14, 16, 19, 17, 21 and 27.
14, 16, 19, 17, 21 और 27 का औसत ज्ञात कीजिए।
(a) 20
(b) 19
(c) 18
(d) 21

Q6. Find the average of square of first 15 natural numbers
पहले 15 प्राकृतिक संख्याओं के वर्ग का औसत ज्ञात कीजिए
(a) 82.66
(b) 82
(c) 83
(d) 83.66

Q7. The average age of 28 children and their teachers is 30 years. If the teacher’s age is excluded, the average reduces by 1. Find the age of the teacher?
28 बच्चों और उनके शिक्षकों की औसत आयु 30 वर्ष है। यदि शिक्षक की आयु को निकाल दिया जाए, तो औसत में 1 कम हो जाता है। शिक्षक की आयु ज्ञात करें?
(a) 40 years
(b) 58 years
(c) 56 years
(d) 60 years

Q8. Find the average of the first 11 prime numbers
पहली 11 अभाज्य संख्याओं का औसत ज्ञात कीजिए
(a) 14.54
(b) 14
(c) 15.54
(d) None of these/ इनमें से कोई नहीं

Q9. The average score of a student in 3 subjects is 38 and in 4 other subjects is 42. Then find the average score in all the 7 subjects.
3 विषयों में एक छात्र का औसत स्कोर 38 है और 4 अन्य विषयों में 42 है। तो सभी 7 विषयों में औसत अंक ज्ञात करें
(a) 40.54
(b) 44
(c) 40.28
(d) None of these/ इनमें से कोई नहीं

Q10. The average age of 95 employees of a company is 32 years. 10 of them whose average age is 28 years leave the company and other 10 employees whose average age is 23 years join the company. Find the new average age of the company?
एक कंपनी के 95 कर्मचारियों की औसत आयु 32 वर्ष है। उनमें से 10 जिनकी औसत आयु 28 वर्ष है, कंपनी छोड़ देते हैं और अन्य 10 कर्मचारी जिनकी औसत आयु 23 वर्ष है, कंपनी से जुड़ जाते हैं। कंपनी की नई औसत आयु ज्ञात कीजिए?
(a) 31.47
(b) 32.47
(c) 30.47
(d) 33.47

Solutions

Average based Mathematics Quiz For CTET Exam : 20th Feb 2020_50.1

Average based Mathematics Quiz For CTET Exam : 20th Feb 2020_60.1

S3. Ans.(a)
Sol. the average of 16 observations = 26
Total of 16 observations = 26×16= 416
Average of 17 observations = 27
Total of 17 observations =27×17 = 459
The 17th observation = 459-416= 43

S4. Ans.(c)
Sol. let the smallest even number = x
x+x+2+x+4+x+6+x+8+x+10= 27×6
6x+30= 162
6x= 132
x= 22
Largest number = x+10
= 22+10= 32

Average based Mathematics Quiz For CTET Exam : 20th Feb 2020_70.1

Average based Mathematics Quiz For CTET Exam : 20th Feb 2020_80.1

S7. Ans.(b)
Sol. average age of 28 children and their teacher= 30
Total age of 28 children and teacher = 30×29= 870
Total age of 28 children = 28×29= 812
Age of teacher = 870-812= 58 years

Average based Mathematics Quiz For CTET Exam : 20th Feb 2020_90.1

Average based Mathematics Quiz For CTET Exam : 20th Feb 2020_100.1

Average based Mathematics Quiz For CTET Exam : 20th Feb 2020_110.1

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