model 7 average on ages/weight Practice Questions Answers Test with Solutions & More Shortcuts
average PRACTICE TEST [9 - 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
Question : 46 [SSC MTS 2013]
The average age of four boys A, B, C and D is 5 years and the average age of A, B, D, E is 6 years. C is 8 years old. The age of E is (in years)
a) 13
b) 12
c) 15
d) 14
Answer »Answer: (b)
A + B + C + D = 20 years
⇒ A + B + D = 20 – 8 = 12 years
Now, A + B + D + E = 24 years
∴ E = 24 – 12 = 12 years
Question : 47 [SSC CGL 2005]
The average age of eleven players of a cricket team decreases by 2 months when two new players are included in the team replacing two players of age 17 years and 20 years. The average age of new player is
a) 17 years 7 months
b) 17 years 1 month
c) 18 years 3 months
d) 17 years 11 months
Answer »Answer: (a)
Easy method:
Average age of new players
= { (20+17)11×$2/12$ }×$1/2$
$422/{12×2}$ =$211/12$⇒ 17$7/12$
= 17 years 7 months
Question : 48 [SSC CGL Prelim 2000]
The average age of four brothers is 12 years. If the age of their mother is also included, the average is increased by 5 years. The age of the mother (in years) is :
a) 43 years
b) 37 years
c) 53 years
d) 48 years
Answer »Answer: (b)
Average age of 4 brothers = 12 yrs.
Total age of 4 brothers = 4 × 12 = 48 yrs.
Average age of 4 brothers + mother ( = 5 persons) = 12 + 5 = 17 yrs.
∴Total age of 4 brothers + mother = 5 × 17 = 85 yrs.
∴The age of the mother = 85 – 48 = 37 yrs.
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, x = 5, n = 4
Age of mother = Average+x (n+1)
= 12 + 5 (4 + 1)
= 12 + 25 = 37 years
Question : 49
Out of 10 teachers of a school, one teacher retires and in his place, a new teacher of age 25 years joins. As a result, average age of teachers reduces by 3 years. The age of the retired teacher is
a) 55 years
b) 50 years
c) 60 years
d) 58 years
Answer »Answer: (a)
Total age decreased = 10 × 3 = 30 years.
∴ Age of the retired teacher = 25 + 30 = 55 years.
Aliter : Using Rule 23,
Here, n = 10, x = 3
Age of new teacher = Age of retired teacher – xn
25 = Age of retired teacher – 10 × 3
= Age of retired teacher
= 25 + 30 = 55 years
Question : 50 [SSC CGL Prelim 2004]
3 years ago, the average age of a family of 5 members was 17 years. A baby having been born, the average age of the family is the same today. The present age of the baby is :
a) 2 years
b) 3 years
c) 1 year
d) 1$1/2$ years
Answer »Answer: (a)
Total age of 5 members, 3 years ago = 17 × 5 = 85 years
Total age of 5 members, now
= (85 + 3 × 5) = 100 years
Total age of 6 members, now
= 17 × 6 = 102 years
∴ Age of the baby
= 102 – 100 = 2 years
Aliter : Using Rule 17,
( 't’ years before, the average age of N members of a family was 'T’ years. If during this period 'n’ children increased in the family but average age (present) remains same, then,
Present age of n children = n.T – N.t )
Here, t = 3, N = 5, T = 17, n = 1
Present age of baby = nT – Nt
= 1 × 17 – 5 × 3
= 17 – 15 = 2 years
IMPORTANT quantitative aptitude 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 »
model 7 average on ages/weight Shortcuts »
Click to Read...model 7 average on ages/weight Online Quiz
Click to Start..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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