model 1 basic average questions 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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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) 55
(b) 65
(c) 45
(d) 35
The correct answers to the above question in:
Answer: (c)
Let average marks of remaining 30 students be x.
∴ 65 = ${30×85+30×x}/60$
⇒ 65 × 60 = 2550 + 30x
⇒ 3900 = 2550 + 30x
⇒ 30x = 3900 – 2550 = 1350
⇒ x = $1350/30$ = 45.
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Read more simple average Based Quantitative Aptitude Questions and Answers
Question : 1
A librarian purchased 50 story– books for his library. But he saw that he could get14 more books by spending Rs. 76 more and the average price per book would be reduced by Re. 1. The average price (in Rs.) of each book he bought, was :
a) 25
b) 20
c) 10
d) 15
Answer »Answer: (c)
Let the average cost of each book bought (of 64 books) be Rs.x.
According to the question,
64 × x – 50(x + 1) = 76
⇒ 64x – 50x – 50 = 76
⇒ 14x = 76 + 50 = 126
⇒ x = $126/14$ = 9
∴ Required average price
= 9 + 1 = Rs. 10
Question : 2
Total weekly emoluments of the workers of a factory is Rs.1534. Average weekly emolument of a worker is Rs.118. The number of workers in the factory is :
a) 13
b) 12
c) 14
d) 16
Answer »Answer: (a)
Using Rule 1,
Average of two or more numbers/quantities is called the mean of these numbers, which is given by
$\text"Average(A)" = \text"Sumof observation / quantities"/\text"No of observation / quantities"$
∴ S = A × n
Number of workers in the factory = $1534/118$ = 13
Question : 3
The average weight of first 11 persons among 12 persons is 95 kg. The weight of 12th person is 33 kg more than the average weight of all the 12 persons. The weight of the 12th person is
a) 131 kg
b) 97.45 kg
c) 128 kg
d) 128.75 kg
Answer »Answer: (a)
Weight of 12th person = x kg (let).
∴ Average weight of 12 persons
= $({11×95+x}/12)$kg
According to the question,
${11×95+x}/12$ +33 = x
⇒ 1045 + x + 396 = 12x
⇒ 1441 = 11x
⇒ x = $1441/11$ = 131 kg.
Question : 4
The average monthly salary of all the employees in an industry is Rs.12,000. The average salary of male employees is Rs.15,000 and that of female employees is Rs.8,000. What is the ratio of male employees to female employees ?
a) 4 : 3
b) 2 : 5
c) 3 : 4
d) 5 : 2
Answer »Answer: (a)
Male employees = x
Female employees = y
∴ (x + y) 12000 = x × 15000 + y × 8000
⇒ (x + y) × 12 = 15x + 8y
⇒ 12x + 12y = 15x + 8y
⇒ 3x = 4y
⇒ $x/y$ = $4/3$ ⇒ x : y = 4 : 3
Question : 5
If the average weight of 6 students is 50 kg; that of 2 students is 51 kg; and that of other 2 students is 55 kg; then the average weight of all students is
a) 52 kg
b) 51.2 kg
c) 51.5 kg
d) 61 kg
Answer »Answer: (b)
Using Rule 10,
If the average of '$n_1$' numbers is $a_1$ and the average of '$n_2$' numbers is $a_2$, then average of total numbers $n_1$ and $n_2$ is
$Average = {n_1a_1 + n_2a_2}/{n_1 + n_2}$
Required average weight
$(50×6+51×2+55×2)/10$
= ${300+102+110}/10$ = $512/10$
= 51.2 kg
Question : 6
A library has an average number of 510 visitors on Sunday and 240 on other days. The average number of visitors per day in a month of 30 days beginning with Sunday is :
a) 300
b) 290
c) 295
d) 285
Answer »Answer: (d)
That month will have 5 sundays.
∴ Required average
= ${5×510+25×240}/30$
= ${2550+6000}/30$
= $8550/30$ = 285
Aliter : Using Rule 10,
Here, $n_1$ = 5, $a_1$ = 510
$n_2$ = 25, $a_2$ = 240
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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