Ratio And Proportion

Only available for you

21 The ratio between the ages of A and B is 3: 5 and the sum of their ages is 56 yr. The ratio between their ages 7 yr ago was

A
3 : 4
B
3 : 5
C
1 : 2
D
2 : 3

22 Find the value of $$\frac{a+b}{a-b}$$, if $$\frac{a}{b} = \frac{5}{3}$$

A
$$\frac{1}{2}$$
B
$$\frac{2}{3}$$
C
$$\frac{1}{4}$$
D
$$\frac{1}{3}$$

23 If A : B = 2: 3, B : C = 5: 7 and C : D = 3:10, then what is A : D equal to?

A
1 : 7
B
2 : 7
C
1 : 5
D
3 : 2

24 If 4 a = 56 and 76 = 9c, then a: b: c is equal to

A
45 : 36 : 28
B
44 : 33 : 28
C
28 : 36 : 45
D
36 : 28 : 45

25 35% of a number is two times 75% of another number. What is the ratio between the first and the second number, respectively?

A
35 : 6
B
31 : 7
C
30 : 7
D
32 : 9

26 If xy = 36, then which of the following is correct?

A
x : 9 = 4 : y
B
9 :×= 4 : y
C
x: 17 = y : 7
D
x: 7 = y : 17

27 If x: y = 7: 5, then what is the value of (5x - 2y) : (5x + 2y)

A
5/4
B
6/5
C
25/31
D
31/42

28 If a+b : b+c : c+a = 6:7:8 and a + b+ c = 14, then find c:

A
6
B
7
C
8
D
10

29 Two numbers are in the ratio of 4 : 7. If 5 is subtracted from each, the ratio becomes 1 : 2. Find the greater number:

A
15
B
40
C
20
D
35

30 Divide ₹ 990 into 3 parts in such a way that half of the first part, one-third of the second part and onefifth of the third part are equal

A
198, 494, 298
B
198, 297, 495
C
200, 300, 490
D
196, 298, 496