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 !!

**The students in 3 classes are in the ratio 3:4:5.If 20 students added in each class, the ratio becomes 5:6:7.Find the total no of students in all the 3 classes now ?**

A.160

B.170

C.180

D.200

E.None of these

###### Answer & Explanation

Answer –**C.180**

**Explanation :**

5x+6x+7x+ 18x = 180

X=10

Check 3x+4x+5x = 12x = 120

120+60 = 180

**Two equal containers are filled with water and acid. The concentration of acid in each container is 20% and 30%. What is the ratio of water in both the containers respectively ?**

A.7:8

B.8:7

C.6:4

D.3:2

E.None of these

###### Answer & Explanation

Answer –**B.8:7**

**Explanation :**

Acid : 20 30

Water : 80 70 => 8:7

**A horse takes 8 steps for every 5 steps of a fox, but 6 steps of a fox are equal to the 3 steps of the horse. What is the ratio of the speed of horse to the fox ?**

A.16:5

B.20:19

C.18:23

D.17:21

E.None of these

###### Answer & Explanation

Answer –**B.16:5**

**Explanation :**

6 step fox=3 step horse = 2:1

16 step fox=8step horse=5 step fox

16 step fox=5 step fox

16:5

**The ratio of age of Krish and her mother is 5:12 and difference of their ages is 21. What will be the ratio of their ages after 3 years ?**

A.7:15

B.11:5

C.13:7

D.9:13

E.None of these

###### Answer & Explanation

Answer –**D.6:13**

**Explanation :**

12x-5x =>7x = 21

X=21/7 =3

Present ratio = 15:36

After 3 years = 18:39 = 6:13

**A started a business with Rs.32,000 after 4 months B joins with the business by investing Rs.48,000.At the end of the year, in what ratio should share their profit ?**

A.8:7

B.7:6

C.5:7

D.9:5

E.None of these

###### Answer & Explanation

Answer –**A.1:1**

**Explanation :**

32000*12 : 48,000*8 = 32*12 : 42*8

384 : 384 = 1:1

**A working partner gets 25% as his commissions after his commissions paid that is equal to Rs.7500, then what is the total profit ?**

A.Rs.32,000

B.Rs.30,000

C.Rs.37,500

D.Rs.40,000

E.None of these

###### Answer & Explanation

Answer –**C.Rs.37,500**

**Explanation :**

X=total profit

25/100*[x-7500] = 7500

x-7500 = 7500*100/25 =30,000

x = 37,500

**Equal quantities of 3 mixtures of milk and water are mixed in the ratio 1:3, 2:3 and 3:4.The ratio of water and milk in the new mixture is**

A.45:76

B.151:269

C.123:154

D.145:245

E.None of these

###### Answer & Explanation

Answer –**B.151:269**

**Explanation :**

Milk = 1/4 : 2/5 :3/7

= 35/140 :56/140 : 60/140

Quantity of milk in new mix = 35+56+60 = 151

Quantity of water in new mix = 140*3 = 420-151 = 269

M:W = 151:269

**The speed of P, Q and R are in the ratio of 2:3:6, what is the ratio of time taken by each one of them for the same distance ?**

A.5:7:2

B.3:2:4

C.1:2:3

D.3:2:1

E.None of these

###### Answer & Explanation

Answer –**D.3:2:1**

**Explanation :**

Speed = ½ : 1/3: 1/6

= 3/6:2/6:1/6

Time = 3:2:1

**The ratio of income of X and Y is 4:3. The sum of their expenditure is Rs.12,000 and the amount of savings is X is equal to the amount of expenditure of Y.What is the salary of Y?**

A.9000

B.7000

C.12000

D.15000

E.None of these

###### Answer & Explanation

Answer –**A.9000**

**Explanation :**

X’s saving = Expenditure of Y = S

4x-S + S = 12000

X = 3000

3x =3*3000 = 9000

**When 7 is added to the numerator and denominator of the fraction, then the new ratio of numerator and denominator becomes 13:19, what is the original ratio ?**

A.11:13

B.7:9

C.4:7

D.Can’t be determined

E.None of these

###### Answer & Explanation

Answer –**D.Can’t be determined**

**Explanation :**

X+7/y+7 = 13/19 x and y are different variable ,so original fraction cannot be determined

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