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) 11 years
(b) 12 years
(c) 10 years
(d) 10.5 years
The correct answers to the above question in:
Answer: (a)
Father + mother = 2 × 35 = 70 years
Father + mother + son = 27 × 3 = 81 years
∴ Son’s age = 81 – 70 = 11 years
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Read more ages weights Based Quantitative Aptitude Questions and Answers
Question : 1
The average age of 8 men is increased by 2 years when two of them whose age are 21 and 23 years replaced by two new men. The average age of the two new men is
a) 24 years
b) 22 years
c) 30 years
d) 28 years
Answer »Answer: (c)
Overall increase in the total age = 8 × 2 = 16 years
∴ Total age of two new men = 21 + 23 + 16 = 60 years
∴ Average age of new men = $60/2$ = 30 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 = 2, n = 8
Age of new person = Age of replaced person + x
= 24 + 2 × 8
= 24 + 16 = 40 years
Question : 2
In a family of 5 members, the average age at present is 33 years. The youngest member is 9 years old. The average age of the family just before the birth of the youngest member was
a) 29 years
b) 30 years
c) 24 years
d) 25 years
Answer »Answer: (b)
Sum of the present age of family members = 33 × 5 = 165 years 9 years ago,
Sum of their age = 165 – 9 × 5 = 120 years
∴ Required average age = $120/4$ = 30 years
Question : 3
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
Question : 4
5 years ago, the average age of P and Q was 15 years. Average age of P, Q and R today is 20 years. How old will R be after 10 years?
a) 40 years
b) 35 years
c) 50 years
d) 30 years
Answer »Answer: (d)
Present age of (P + Q) = 30 + 10 = 40 years
(P + Q + R)’s present age = 20 × 3 = 60 years
R’s present age = 60 – 40 = 20 years
∴ R’s age after 10 years = 20 + 10 = 30 years
Question : 5
The average age of a husband and his wife was 23 years at the beginning of their marriage. After five years they have a one-year old child. The average age of the family of three, when the child was born, was
a) 24 years
b) 23 years
c) 20 years
d) 18 years
Answer »Answer: (d)
After five years of marriage,
Husband + wife + child
= 46 + 10 + 1 = 57 years
At the time of birth of child,
Husband + wife + child = 57 – 3 = 54 years
∴ Required average age = $54/3$ = 18 years
Question : 6
The average age of A and B is 20 years. If A is to be replaced by C, the average would be 19 years. The average age of C and A is 21 years. The ages of A, B and C in order (in years) are
a) 18, 20, 22
b) 18, 22, 20
c) 22, 20, 18
d) 22, 18, 20
Answer »Answer: (d)
A + B = 2 × 20 = 40
C + B = 2 × 19 = 38
C + A = 2 × 21 = 42
On adding all three,
2 (A + B + C) = 40 + 38 + 42 = 120
⇒ A + B + C = 60
∴ A = (A + B + C) – (B + C)
= 60 – 38 = 22 years
B = (A + B + C) – (A + C)
= 60 – 42 = 18 years
C = (A + B + C) – (A + B)
= 60 – 40 = 20 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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