model 11 percentage with ratios Section-Wise Topic Notes With Detailed Explanation And Example Questions
MOST IMPORTANT quantitative aptitude - 11 EXERCISES
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The following question based on percentage topic of quantitative aptitude
(a) 18
(b) Data Inadequate
(c) 24
(d) 12
The correct answers to the above question in:
Answer: (d)
Let the numbers be 5x and 4x respectively
According to the question,
5x × $40/100$ = 12
2x = 12 ⇒ x = 6
4x of 50% = 4 × 6 × $1/2$ = 12
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Read more ratios based Based Quantitative Aptitude Questions and Answers
Question : 1
If 10% of x is 3 times 15% of y, then find x : y.
a) 8 : 3
b) 11 : 4
c) 9 : 2
d) 7 : 2
Answer »Answer: (c)
According to the question,
$x × 10/100 = 3 × y × 15/100$
10x = 45y
$x/y = 45/10 = 9/2$
Question : 2
The ratio of the number of boys and girls in a school is 3 : 2. If 20% of the boys and 30% of the girls are scholarship holders, then the percentage of students, who do not get scholarship, is
a) 75%
b) 76%
c) 72%
d) 50%
Answer »Answer: (b)
Let the number of boys = 3x and that of girls = 2x
Number of boys who do not hold scholarship = 80% of 3x
= $3x × 80/100 = {12x}/5$
Number of girls who do not hold scholarship
= $2x × 70/100 = {14x}/10$
Number of students who do not hold scholarship
= ${12x}/5 + {14x}/10 = {24x + 14x}/10 = {38x}/10$
Required percentage = ${{38x}/10}/{5x} × 100 = 38/{10 × 5} × 100=76%$
Question : 3
If A exceeds B by 60% and B is less than C by 20%, then A : C is
a) 8 : 5
b) 4 : 5
c) 25 : 32
d) 32 : 25
Answer »Answer: (d)
Let C = 100; B = 80
A = ${80 × 160}/100 = 128$
A : C = 128 : 100 = 32 : 25
Question : 4
The ratio of the number of boys to that of girls in a school is 4 : 1. If 75% of boys and 70% of the girls are scholarship-holders, then the percentage of students who do not get scholarship is
a) 75%
b) 26%
c) 28%
d) 50%
Answer »Answer: (b)
Let the number of boys and girls be 4x and x respectively.
Number of boys who hold scholarship. = $75/100 × 4x = 3x$
and number of girls who hold scholarship = ${70 × x}/100 = {7x}/10$
Number of students who do not hold scholarship
= $5x - 3x - {7x}/10 = 2x - {7x}/10$
= ${20x - 7x}/10 = {13x}/10$
The required percentage = ${{13x}/10}/{5x} × 100$
= ${13x}/{10 × 5x} × 100 = 26$%
Question : 5
The ratio of the number of boys and girls in a school is 2 : 3. If 25% of the boys and 30% of the girls are scholarship holders, the percentage of the school students who are not scholarship holders is
a) 54
b) 60
c) 36
d) 72
Answer »Answer: (d)
Boys in school = 2x
Girls = 3x
Students who are not scholarship holders :
Boys ⇒ ${2x × 75}/100 = {6x}/4$
Girls ⇒ ${3x × 70}/100 = {21x}/10$
Total students who donot hold scholarship = ${6x}/4 + {21x}/10$
= ${30x + 42x}/20 = {72x}/20 = {18x}/5$
Required percentage = ${{18x}/5}/{5x} ×100$ = 72%
Question : 6
If 15% of x is same as 20 % of y then x : y is
a) 6 : 5
b) 3 : 4
c) 5 : 4
d) 4 : 3
Answer »Answer: (d)
$x × 15/100 = y × 20/100$
x × 15 = y × 20
$x/y = 20/15 = 4/3$ = 4 : 3
GET percentage PRACTICE TEST EXERCISES
model 1 simple percentage questions
model 2 net increase or decrease in %
model 3 reducing & exceeding prices
model 4 x & y comparison
model 5 income & expenditure
model 6 consumption & remaining
model 7 marks scored in examinations
Model 8 population based
model 9 voters & election
model 10 percentage with allegations & mixture
model 11 percentage with ratios
percentage Shortcuts and Techniques with Examples
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model 1 simple percentage questions
Defination & Shortcuts … -
model 2 net increase or decrease in %
Defination & Shortcuts … -
model 3 reducing & exceeding prices
Defination & Shortcuts … -
model 4 x & y comparison
Defination & Shortcuts … -
model 5 income & expenditure
Defination & Shortcuts … -
model 6 consumption & remaining
Defination & Shortcuts … -
model 7 marks scored in examinations
Defination & Shortcuts … -
Model 8 population based
Defination & Shortcuts … -
model 9 voters & election
Defination & Shortcuts … -
model 10 percentage with allegations & mixture
Defination & Shortcuts … -
model 11 percentage with ratios
Defination & Shortcuts …
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