type 3 addition subtraction product on ratio & proportion Section-Wise Topic Notes With Detailed Explanation And Example Questions
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The following question based on ratio & proportion topic of quantitative aptitude
(a) 6
(b) 8
(c) 3
(d) 1
The correct answers to the above question in:
Answer: (a)
Let the numbers be 3x and 4x.
${3x + 6}/{4x + 6} = 4/5$
16x + 24 = 15x + 30
x = 30 - 24 = 6
Required difference = 6
Using Rule 34Two numbers are in the ratio a:b and if each number is increased by x, the ratio becomes c:d. Then the two numbers will be${xa(c-d)}/{ad-bc}$ and ${xb(c-d)}/{ad-bc}$
Here, a = 3, b= 4, x = 6
c = 4, d = 5
The numbers are = ${xa(c-d)}/{ad-bc}$
= ${6.3(4 - 5)}/{3 ×5 - 4 × 4}$
= ${18 × -1}/{15 - 16}$ = 18
= ${xb(c-d)}/{ad-bc}$
= ${6 × 4(4 - 5)}/{3 × 5 - 4 × 4}$
= ${24 × (-1)}/{15 - 16}$ = 24
Numbers are 24 and 18.
Their difference = 24 - 18 = 6
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Read more addition subtraction product on ratio and proportion Based Quantitative Aptitude Questions and Answers
Question : 1
If the sum of two quantities is equal to three times their difference, then the ratio of the two quantities is
a) 2 : 1
b) 2 : 3
c) 3 : 1
d) 1 : 3
Answer »Answer: (a)
x + y = 3 (x - y)
x + y = 3x - 3y
2x = 4y
$x/y = 2/1$
x : y = 2 : 1
Question : 2
If two numbers are in the ratio 2 : 3 and the ratio becomes 3 : 4 when 8 is added to both the numbers, then the sum of the two numbers is
a) 40
b) 100
c) 80
d) 10
Answer »Answer: (a)
Let the numbers be 2x and 3x respectively.
According to the question,
${2x + 8}/{3x + 8}= 3/4$
9x + 24 = 8x + 32
9x - 8x = 32 - 24 = 8
x = 8
Sum of numbers
= 2x + 3x = 5x
= 5 × 8 = 40
Using Rule 34Two numbers are in the ratio a:b and if each number is increased by x, the ratio becomes c:d. Then the two numbers will be${xa(c-d)}/{ad-bc}$ and ${xb(c-d)}/{ad-bc}$
Here, a = 2, b = 3, x= 8,
c = 3, d = 4
1st Number = ${xa(c-d)}/{ad-bc}$
= ${8 × 2(3 - 4)}/{2 × 4 - 3 × 3}$
= ${- 16}/{- 1}$ = 16
2nd Number = ${xb(c-d)}/{ad-bc}$
= ${8 × 3(3 - 4)}/{2 × 4 - 3 × 3}$
= ${- 24}/{- 1}$ = 24
Sum of numbers = 16 + 24 = 40
Question : 3
Two numbers are in ratio 5 : 8. If their difference is 48, then the smaller number is
a) 128
b) 64
c) 96
d) 80
Answer »Answer: (d)
Numbers = 5x and 8x
According to the question,
8x - 5x = 48
3x = 48 ⇒ x = 16
Smaller number = 5x
= 5 × 16 = 80
GET ratio & proportion PRACTICE TEST EXERCISES
type 1 basic concepts of ratio & proportion
type 2 age based ratio & proportion problems
type 3 addition subtraction product on ratio & proportion
type 4 income & expenditure based ratio & proportion problems
type 5 shares & partnership based ratio & proportion problems
type 6 fractions based ratio & proportion problems
type 7 finding sum difference product based ratio & proportion problems
type 8 alligation & mixtures based ratio & proportion problems
type 9 coins & rupees based ratio & proportion problems
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