Ratio And Proportion

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31 The speeds of three cars are in the ratio of 2:3:4 Find the ratio between the time taken by these cars to cover the same distance:

A
2 : 3 : 4
B
4 : 3 : 2
C
4 : 3 : 6
D
6 : 4 : 3

32 Find the value of a, if 3/2=18/12=24/16=a

A
$$\frac{2}{3}$$
B
3/2
C
4/3
D
$$\frac{3}{4}$$

33 If 0.8×A = 0.09×B, then find A : B:

A
9 : 80
B
3 : 80
C
7 : 80
D
5 : 80

34 In a certain school, the ratio of boys to girls is 7 : 5. If there are 2400 students in the school, then how many girls are there in the school?

A
500
B
700
C
800
D
1000

35 One-half of a certain number is equal to 65% of the 2nd number. Find the ratio of 1st to 2nd number:

A
10 : 13
B
8 : 13
C
13 : 8
D
13 : 10

36 Two numbers are in the ratio 2 : 3. If 9 is added to each number, they will be in the ratio 3 : 4. What is the product of the two numbers?

A
360
B
480
C
486
D
512

37 Amit and Sudesh have invested in the ratio of 4:7. If both invested a total amount of ₹ 49500, then find the investment of Sudesh:

A
₹ 31500
B
₹ 1800
C
₹ 31000
D
₹ 18500

38 The total weight of Sanjay and Suresh is 120 kg. If Sanjay weighs 30 kg more than Suresh, then what is the ratio of the weight of Suresh to that of Sanjay?

A
0.4
B
0.6
C
0.3
D
0.25

39 In a class, the number of boys and girls is in the ratio of 4 : 5. If 10 more boys join the class, the ratio of numbers of boys and girls becomes 6 : 5. How many girls are there in the class?

A
20
B
30
C
25
D
Couldn't be determined

40 A truck covers a distance of 640 km in 10 h. A car covers the same distance in 8 h. What is the respective ratio of the speed of the truck to that of car?

A
3 : 4
B
4 : 5
C
5 : 6
D
6 : 7