# Aptitude Questions: Ratio & Proportion Set 3

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 !!

1. 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
Explanation :
5x+6x+7x+ 18x = 180
X=10
Check 3x+4x+5x = 12x = 120
120+60 = 180
2. 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
Explanation :
Acid : 20    30
Water : 80  70 => 8:7
3. 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
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
4. 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
Explanation :
12x-5x =>7x = 21
X=21/7 =3
Present ratio = 15:36
After 3 years = 18:39 = 6:13
5. 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
Explanation :
32000*12 : 48,000*8 = 32*12 : 42*8
384 : 384 = 1:1
6. 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
Explanation :
X=total profit
25/100*[x-7500] = 7500
x-7500 = 7500*100/25 =30,000
x = 37,500
7. 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
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
8. 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
Explanation :
Speed = ½ : 1/3: 1/6
= 3/6:2/6:1/6
Time = 3:2:1
9. 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
Explanation :
X’s saving = Expenditure of Y = S
4x-S + S = 12000
X = 3000
3x =3*3000 =  9000
10. 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