model 7 average on ages/weight Section-Wise Topic Notes With Detailed Explanation And Example Questions
MOST IMPORTANT quantitative aptitude - 9 EXERCISES
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Basic Average Questions Practice Test, Shortcuts, Tricks, PDF »
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New Average Aptitude MCQ Average of Consecutive Numbers »
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Top 99+ Average Aptitude: Twice, One Third of Numbers MCQ »
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New +99 Average Aptitude MCQ Find nth Average of Numbers »
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99+ Average Aptitude Find New Average from Error MCQ Test »
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Top 99+ Aptitude MCQ Test on Average With Excluded Number »
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Top 99+ Aptitude Average on Ages & Weights MCQ Test Quiz »
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Top Aptitude Average MCQ Find Monthly Income for Average »
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Top 149+ Aptitude Average on Cricket & Exam MCQ Test Quiz »
The following question based on average topic of quantitative aptitude
(a) 32
(b) 31
(c) 30
(d) 35
The correct answers to the above question in:
Answer: (c)
Ram + two children = 51 years
His wife + two children = 48 years
∴ Ram – wife = 3 years
⇒ 33 – wife = 3 years
∴ Wife = 33 – 3 = 30 years
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Read more ages weights Based Quantitative Aptitude Questions and Answers
Question : 1
The average age of 5 boys is 12 years. The average age of 3 others is 16 years. The average age of all the 8 boys is :
a) 14 years
b) 13$1/2$ years
c) 13 years
d) 12$1/2$ years
Answer »Answer: (b)
Required average = ${5 × 12 + 3 × 16}/{5+3}$ =${60+48}/8$
= $108/8$ = $27/2$ = 13$1/2$ years
Question : 2
Five years ago, the average age of P, Q and R was 25 years and seven years ago, the average age of Q and R was 20 years. The present age of P is
a) 29 years
b) 36 years
c) 21 years
d) 24 years
Answer »Answer: (b)
Sum of the present age of P, Q and R
= (25 × 3 + 3 × 5) years
= (75 + 15) years = 90 years
Sum of the present age of Q and R
= (20 × 2 + 2 × 7) years = 54 years
∴ p’s present age = (90 – 54) years = 36 years
Question : 3
The average age of 40 students of a class is 15 years. When 10 new students are admitted, the average is increased by 0.2 year. The average age of the new students is :
a) 16 years
b) 15.2 years
c) 16.4 years
d) 16.2 years
Answer »Answer: (a)
Total age of 40 old students = 40 × 15 = 600 years.
Total age of 40 old and 10 new students = 50 × 15.2 = 760 years
∴ Total age of 10 new students = 760–600 = 160 years.
∴ Required average age = $160/10$ = 16 years.
Question : 4
In a school, the average age of students is 6 years, and the average age of 12 teachers is 40 years. If the average age of the combined group of all the teachers and students is 7 years, then the number of students is :
a) 400
b) 396
c) 416
d) 408
Answer »Answer: (b)
Let the number of students be n. Then,
7 = ${n × 6 + 12 × 40}/{n + 12}$
⇒ 7n + 84 = 6n + 480
⇒ n = 480 – 84 = 396
Question : 5
The average age of a husband and a wife was 27 years when they married 4 years ago. The average age of the husband, the wife and a new-born child is 21 years now. The present age of the child is
a) 3 years
b) 4 years
c) 1 year
d) 2 years
Answer »Answer: (c)
Sum of the present age of husband and wife
= 2 × 27 + 8 = 62 years
Sum of the present age of husband, wife and child
= 21 × 3 = 63 years
∴ present age of the child
= 63 – 62 = 1 year
Question : 6
Out of 10 teachers of a school, one teacher retires and at his place a new teacher of age 25 years joins. As a result of it, the average age of the teachers is reduced by 3 years. The age of the retired teacher is
a) 58 years
b) 60 years
c) 55 years
d) 56 years
Answer »Answer: (c)
The average age is reduced by 3 years.
∴ Age of the retired teacher = 25 + 3 × 10 = 55 years
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
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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 …
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