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) 15 years
(b) 12 years
(c) 13 years
(d) 14 years
The correct answers to the above question in:
Answer: (d)
Total age increase = 2 × 24 = 48 months = 4 years
∴ Age of the new boy = 10 + 4 = 14 years.
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Read more ages weights Based Quantitative Aptitude Questions and Answers
Question : 1
The average age of 40 students of a class is 18 years. When 20 new students are admitted to the same class, the average age of the students of the class is increased by 6 months. The average age of newly admitted student is
a) 19 years 6 months
b) 19 years
c) 20 years 6 months
d) 20 years
Answer »Answer: (a)
Total age of 20 new students
= (60 × 18.5 – 40 × 18) years
= (1110 – 720) years
= 390 years
∴ Their average age = $390/20$ = 19.5 years
= 19 years 6 months
Question : 2
In a class there are 30 boys and their average age is 17 years. On one boy aged 18 years leaving the class and another joining, the average age becomes 16.9 years. The age of new boy is
a) 11 years
b) 25 years
c) 15 years
d) 13 years
Answer »Answer: (c)
Age of new boy = 18 years – total decrease
= (18 – 0.1 × 30) years = 15 years
Aliter : Using Rule 23,
( If in a group, one member is replaced by a new member, then,
Age of new member = ( age of replaced member) ± xn
where, x = increase (+) or decrease (–) in average n = Number of members. )
Here, x = 17 – 16.9 = 0.1, n = 30
Age of new boy
= Age of replaced boy–xn
= 18 – 0.1 × 30
= 18 – 3 = 15 years
Question : 3
The average age of 20 boys in a class is 12 years. 5 new boys are admitted to the class whose average age is 7 years. The average age of the boys in the class becomes
a) 9.5 years
b) 8.2 years
c) 11 years
d) 12.5 years
Answer »Answer: (c)
New average age of class
= ${20 × 12 + 5 × 7}/25$ = ${240+35}/25$
= $275/25$ = 11 years
Question : 4
The average age of 45 persons is decreased by $1/9$ year when one of them of 60 years is replaced by a new comer. Then the age of the new comer is :
a) 55 years
b) 45 years
c) 49 years
d) 59 years
Answer »Answer: (a)
Reduction in total age of 45 persons = 45 × $1/9$
Age of the new person
= 60 – 45 × $1/9$ = 55 years
Aliter : Using Rule 23,
( If in a group, one member is replaced by a new member, then,
Age of new member = ( age of replaced member) ± xn
where, x = increase (+) or decrease (–) in average n = Number of members. )
Age of new corner = Age of replaced member – xn
= 60 – 45 × $1/9$
= 60 – 5 = 55 years
Question : 5
In a school with 600 students, the average age of the boys is 12 years and that of the girls is 11 years. If the average age of the school is 11 years and 9 months, then the number of girls in the school is
a) 150
b) 450
c) 350
d) 250
Answer »Answer: (a)
Number of girls = x
Number of boys = 600 – x
∴ (600 – x ) × 12 + 11x
= 11$3/4$×600 = $47/4$ × 600
⇒ 7200 – 12x + 11x = 7050
⇒ x = 7200 – 7050 = 150
Question : 6
The average age of 9 students and their teacher is 16 years. The average age of the first four students is 19 years and that of the last five is 10 years. The teacher’s age is
a) 34 years
b) 36 years
c) 28 years
d) 30 years
Answer »Answer: (a)
Teacher’s age
= 16 × 10 – 19 × 4 – 5 × 10
= 160 – 76 – 50 = 34 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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