model 8 find monthly income Section-Wise Topic Notes With Detailed Explanation And Example Questions
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The following question based on average topic of quantitative aptitude
(a) Rs.225
(b) Rs.200
(c) Rs.125
(d) Rs.106.25
The correct answers to the above question in:
Answer: (a)
Total income of A and B
= Rs. (2 × 200) = Rs. 400
Total income of C and D
= Rs. (2 × 250) = Rs. 500
∴ Required average
= ${400+500}/4$ = $900/4$ = Rs. 225
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Read more finding monthly income Based Quantitative Aptitude Questions and Answers
Question : 1
The average monthly expenditure of a family for the first four months is Rs.2570, for the next three months Rs.2490 and for the last five months Rs.3030. If the family saves Rs.5320 during the whole year, the average monthly income of the family during the year is
a) Rs.3580
b) Rs.3200
c) Rs.3185
d) Rs.3000
Answer »Answer: (c)
Total annual expenditure of the family
=Rs.(4 × 2570 + 3 × 2490 + 5 × 3030)
=Rs.(10280 + 7470 + 15150)
=Rs.32900
Total income
=Rs.(32900 + 5320)
=Rs.38220
∴ Required average monthly income = $38220/12$ =Rs.3185
Question : 2
The average daily income of 7 men, 11 women and 2 boys is Rs. 257.50. If the average daily income of the men is Rs.10 more than that of women and the average daily income of the women is Rs.10 more than that of boys, the average daily income of a man is
a) Rs. 257
b) Rs. 265
c) Rs. 250
d) Rs. 277.5
Answer »Answer: (b)
Average daily salary :
Men ⇒ Rs. x (let).
Women ⇒ Rs. (x – 10)
Boys ⇒ Rs. (x – 20)
According to the question,
7x + 11 (x – 10) + 2 (x – 20) = 20 × 257.5
⇒ 7x + 11x – 110 + 2x – 40 = 5150
⇒ 20x – 150 = 5150
⇒ 20x = 5150 + 150 = 5300
⇒ x = $5300/20$ = Rs. 265
Question : 3
The average monthly income of A and B is Rs.14000, that of B and C is Rs.15600 and A and C is Rs.14400. The monthly income of C is
a) Rs.15500
b) Rs.14000
c) Rs.15000
d) Rs.16000
Answer »Answer: (d)
A + B =Rs.28,000 ...(i)
B + C = Rs.31,200 ...(ii)
C + A = Rs. 28,800 ...(iii)
Adding,
2(A + B + C) = 88000
⇒ A + B + C = 44000
From equation (i),
28000 + C = 44000
⇒ C = 44000 – 28000 = Rs.16000
Question : 4
A man spends Rs.1800 monthly on an average for the first four months and Rs.2000 monthly for the next eight months and saves Rs.5600 a year. His average monthly income is
a) Rs.2600
b) Rs.2400
c) Rs.2200
d) Rs.2000
Answer »Answer: (b)
Total expenditure of man in a year
=Rs.(4 × 1800 + 8 × 2000)
=Rs.(7200 + 16000)
=Rs.23200
Total annual income
= (23200 + 5600)
=Rs.28800
∴ Average monthly income = $28800/12$ =Rs.2400
Question : 5
The average expenditure of a man for the first five months is Rs.1200 and for the next seven months is Rs.1300. If he saves Rs.2900 in that year, his monthly average income is :
a) Rs.1400
b) Rs.1700
c) Rs.1600
d) Rs.1500
Answer »Answer: (d)
Total annual expenditure of man
= Rs.(5 × 1200 + 7 × 1300)
= Rs. (6000 + 9100)
= Rs. 15100
His total annual income
= Rs. (15100 + 2900)
= Rs. 18000
∴ Average monthly income = $18000/12$ = Rs. 1500
Question : 6
The average monthly salary of 19 members of a group is Rs. 16000. If one more member whose monthly salary is Rs. 20000 joins the group, then the average salary of the group is
a) Rs. 16250
b) Rs. 18000
c) Rs. 16200
d) Rs. 18250
Answer »Answer: (c)
Required average
=Rs. $({16000 ×19+20000}/20)$
=Rs.$({304000+20000}/20)$
=Rs. $(324000/20)$
=Rs.16200
OR
Difference = Rs. (20000 – 16000) = Rs. 4000
∴ Increase in average = $4000/20$ = Rs. 200
∴ Required average
= Rs. (16000 + 200)
= Rs. 16200
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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