Hello Aspirants. Welcome to Online Quantitative Aptitude section in AffairsCloud.com. Here we are creating question sample in **Ratio & Proportion** , which is common for all the competitive exams. We have included Some questions that are repeatedly asked in exams !!

**Find out the third proportion of the term 12 and 24**

A)38

B)44

C)48

D)42

###### Answer

**C)48**

Explanation :

12:24 :: 24 : ?

? = (24*24)/12 = 48

**If a:b = 2:3, b:c = 6:5 and c:d = 3:5 then find the value of a:b:c:d**

A)18:25:12:18

B)12:18:15:25

C)25:18:15:12

D)12:25:18:25

###### Answer

**B) 12:18:15:25**

Explanation :

a:b = 2:3 = 12:18

b:c = 6:5 = 18:15

c:d = 3:5 = 15 :25

a:b:c:d = 12:18:15:25

**If x:y = 4:7, the value of (x**^{2}+ y^{2}) /(x^{2}– y^{2}) = ?

A)-33/65

B)65/33

C)33/65

D) -65/33

###### Answer

**D) -65/33**

Explanation :

X = 4a; y = 7a

(x^{2}+ y^{2}) /(x^{2}– y^{2}) = (4a)^{2}+ (7a)^{2}/ (4a)^{2 }– (7a)^{2}

= a^{2}(16+49)/ a^{2}(16-49)

= -65/33

**The ratio of boys and girls in the school is 7:9 when 22 new boys are joined in this school then the ratio become 9:10.How many girls in this school ?**

A)180

B)200

C)160

D)220

###### Answer

**A)180**

Explanation :

7x+22/9x = 9/10

70x+220 = 81x

11x = 220

X =20

20*9 = 180 girls(7B:9G)

**Two numbers are in the ratio of 5:8 .If 4 is subtracted from each then the ratio become 1:2.The small number is**

A)16

B)4

C)10

D)2

###### Answer

**C)10**

Explanation :

5x-4/8x-4 = ½

10x-8 = 8x-4

2x = 4

X=2

5(2) = 10

**x:y = 7:4 then (4x+7y) : (7x+4y)**

A)65:56

B)56:65

C)34:45

D)13:18

###### Answer

**B)56:65**

Explanation :(4(7)+7(4)) : (7(7)+4(4)) = 56:65

**The sum of present age of 2 persons is 100yrs.Before 5 years the ratio of their ages is 5:13.Find the age of younger person**

A)15

B)20

C)25

D)30

###### Answer

**D)30**

Explanation :

From option

30+70 = 100

25:65 = 5:13

**The ratio of monthly income of A and B in the ratio is 6:5 and the ratio of their expenditure is 9:7.If each saves Rs.1500.Then the sum of their salary is**

A)11,000

B)9,000

C)1,0000

D)12,000

###### Answer

**A)11,000**

Explanation :

4500:3500 – e

1500:1500 – s

6000 + 5000 = 11000

**What number should be added or subtracted from each term in the ratio 11:9 so that it become 6:5**

A)+4

B)-4

C)-5

D)-3

###### Answer

**A)+4**

Explanation :

44:36

Add 4

48:40 = 6:5

**The ratio of two persons A and B salaries in the ratio 12:7 if 12% increased salary yearly then what will be the B Salary after 2 yrs.**

A)7808

B)8700

C)7,500

D)8781

###### Answer

**D)8781**

Explanation :

12:7 = 12,000 : 7,000

12% = B = 840……1st yr and B = 941 …..2nd yr

New inc B = 7000+840+941 = 8781

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