model 6 find average of excluded number Section-Wise Topic Notes With Detailed Explanation And Example Questions
MOST IMPORTANT quantitative aptitude - 9 EXERCISES
-
Basic Average Questions Practice Test, Shortcuts, Tricks, PDF »
-
New Average Aptitude MCQ Average of Consecutive Numbers »
-
Top 99+ Average Aptitude: Twice, One Third of Numbers MCQ »
-
New +99 Average Aptitude MCQ Find nth Average of Numbers »
-
99+ Average Aptitude Find New Average from Error MCQ Test »
-
Top 99+ Aptitude MCQ Test on Average With Excluded Number »
-
Top 99+ Aptitude Average on Ages & Weights MCQ Test Quiz »
-
Top Aptitude Average MCQ Find Monthly Income for Average »
-
Top 149+ Aptitude Average on Cricket & Exam MCQ Test Quiz »
The following question based on average topic of quantitative aptitude
(a) 36.5 kg
(b) 38.35 kg
(c) 39.2 kg
(d) 37.3 kg
The correct answers to the above question in:
Answer: (a)
Total weight of 40 children = 40 × 36.2 kg = 1448 kg
Total weight of 43 children = 1448 + 42.3 + 39.7 + 39.5 = 1569.5 kg
∴ Required average weight = $1569.5/43$ = 36.5 kg
Discuss Form
Read more excluded numbers Based Quantitative Aptitude Questions and Answers
Question : 1
There are 50 students in a class. Their average weight is 45 kg. When one student leaves the class the average weight reduces by 100g. What is the weight of the student who left the class ?
a) 47.9 kg
b) 49.9 kg
c) 45 kg
d) 50.1 kg
Answer »Answer: (b)
Weight of the student who left = 50 × 45 – 49 × 44.9
= 2250 – 2200.1 = 49.9 kg.
Question : 2
The mean weight of 34 students of a school is 42 kg. If the weight of the teacher be included, the mean rises by 400 grams. Find the weight of the teacher (in kg).
a) 57 kg
b) 66 kg
c) 55 kg
d) 56 kg
Answer »Answer: (d)
Weight of the teacher = 42 kg. + ${35 × 400}/1000$kg
= 42 + 14 = 56 kg.
Aliter : Using Rule 24,
Here, x = $400/100$ = 0.4, n = 34
Weight of teacher = Average + x (n + 1)
= 42 + 0.4 (34 + 1)
= 42 + 14 = 56 kg
Question : 3
The average of five numbers is 140. If one number is excluded, the average of the remaining four numbers is 130. The excluded number is :
a) 134
b) 180
c) 135
d) 150
Answer »Answer: (b)
Required number = 5 × 140 – 4 × 130
= 700 – 520 = 180
Aliter : Using Rule 25,
Here, x = (140 – 130) = 10, n = 5
Excluded number = Average + x (n – 1)
= 140 + 10 × 4 = 180
Question : 4
The average of five numbers is 7. When three new numbers are included, the average of the eight numbers becomes 8.5. The average of the three new numbers is
a) 10.5
b) 11
c) 9
d) 11.5
Answer »Answer: (b)
Sum of the three new numbers
= 8 × 8.5 – 5 × 7 = 68 – 35 = 33
∴ Required average = $33/3$ = 11
Question : 5
Average weight of 25 students of a class is 50 kg. If the weight of the class teacher is included, the average is increased by 1 kg. The weight of the teacher is
a) 77 kg
b) 74 kg
c) 76 kg
d) 75 kg
Answer »Answer: (c)
Weight of teacher = 50 + 26 × 1 = 76 kg
Aliter : Using Rule 24,
( If a new member is added in a group then. age (or income) of added member = Average (or income) ± x (n + 1)
where x = increase (+) or decrease (–) in average age (or income) n = Number of members. )
Here, N = 50, T = 45, t = $1/10$ = 0.1
Weight of teacher = Average + × (n + 1)
= 50 + 1 (25 + 1)
= 50 + 26 = 76 kg
Question : 6
In a class, the average score of girls in an examination is 73 and that of boys is 71. The average score for the whole class is 71.8. Find the percentage of girls.
a) 50%
b) 55%
c) 40%
d) 60%
Answer »Answer: (c)
Let the number of boys be x and that of girls be y.
∴ 71x + 73y = 71.8 (x + y)
⇒ 71.8x – 71x = 73y – 71.8y
⇒ 0.8x = 1.2y
⇒ $\text"x"/ \text"y"$ = ${1.2}/{0.8}$ = $12/8$ = $3/2$
∴ $\text"x"/\text"y"$+1 = $3/2$ + 1⇒ $\text"x+y"/ \text"y"$ = $5/2$
∴ Percentage of girls
= $\text"y"/ \text"x+y"$ × 100= $2/5$ × 100= 40%
GET average PRACTICE TEST EXERCISES
model 1 basic average questions
model 2 average of consecutive numbers
model 3 twice, thrice, one third etc. of numbers
model 4 find nth average from 1st & last number
model 5 find new average from error
model 6 find average of excluded number
model 7 average on ages/weight
model 8 find monthly income
model 9 average on cricket/exam
average Shortcuts and Techniques with Examples
-
model 1 basic average questions
Defination & Shortcuts … -
model 2 average of consecutive numbers
Defination & Shortcuts … -
model 3 twice, thrice, one third etc. of numbers
Defination & Shortcuts … -
model 4 find nth average from 1st & last number
Defination & Shortcuts … -
model 5 find new average from error
Defination & Shortcuts … -
model 6 find average of excluded number
Defination & Shortcuts … -
model 7 average on ages/weight
Defination & Shortcuts … -
model 8 find monthly income
Defination & Shortcuts … -
model 9 average on cricket/exam
Defination & Shortcuts …
Verbal Reasoning
Question & Answer Quiz
Non Verbal Reasoning
Question & Answer Quiz
Quantitative Aptitude
Question & Answer Quiz
Computer MCQ
Question & Answer Quiz
General English
Question & Answer Quiz
History GK
Question & Answer Quiz
Polity GK
Question & Answer Quiz
Geography GK
Question & Answer Quiz
Economy GK
Question & Answer Quiz
General Awareness GK
Question & Answer Quiz
Recently Added Subject & Categories For All Competitive Exams
New 150+ Percentage Questions For IBPS Clerk Prelims 2024
Free Top Percentage Quants Aptitude based Multiple Choice Questions and Answers Practice Test Series, Quiz PDF & Mock Test for IBPS Clerk Prelims 2024 Exam
Continue Reading »
Classification Reasoning MCQ For IBPS Clerk Prelims 2024
Most Important 100+ Classification based Verbal Reasoning Ability Multiple choice questions and answers PDF, Free New Mock tests For IBPS Clerk Prelims 2024
Continue Reading »
Ratio and Proportion Questions with Solutions, IBPS Clerk
New Ratio and Proportion Quants Aptitude based Multiple Choice Questions and Answers Practice Test Series, Quiz & Mock Test for IBPS Clerk Prelims 2024 Exam
Continue Reading »
Top Analogy Reasoning Ability For IBPS Clerk Prelims 2024
Most Important Analogy based Verbal Reasoning Multiple choice questions and answers practice quiz series PDF, Free New Mock tests For IBPS Clerk Prelims 2024
Continue Reading »