# Ratio and Proportion ( 21 to 25 )

#### Prev     Next

Ratio and Proportion ( 21 to 25 ):

# APTITUDE QUESTIONS (RATIO AND PROPORTION):

21. In a school, 10% of the boys are same in number as 1/4 th of the girls. What will be the ratio of boys to girls in that school?

A)    3:2

B)    5:2

C)    2:1

D)    4:3

E)    None of these

Explanation:

10% of B = 1/4 G <=> 10B/100 = 1/4 G <=> B = 5/2 G
∴ B/G = 5/2 <=> B : G = 5:2

22. If 10% of x = 20% of y, then x:y is equal to :

A)    1:2

B)    2:1

C)    5:1

D)    10:1

E)    None of these

Explanation:

Let 10% of x = 20% of y <=> 10x/100 = 20y/100 <=> x/10 = y/5 <=> x/y = 10/5 = 2/1
x : y = 2:1

23. The compounded ratio of (2:3), (6:11) and (11:2) is:

A)    1:2

B)    2:1

C)    11:24

D)    36:121

E)    None of these

Explanation:

Required Ratio = (2/3 * 6/11 * 11/2) = 2/1 = 2:1

24. If 0.4 of a number is equal to 0.06 of another number, the ratio of the numbers is:

A)    2:3

B)    3:4

C)    3:20

D)    20:3

E)    None of these

Explanation:

0.4A = 0.06B <=> A/B = 0.06/0.40 = 6/40 = 3/20
∴ A : B = 3:20

25. Which of the following ratios is greatest?

A)    7:15

B)    15:23

C)    17:25

D)    21:29

E)    None of these

Explanation:

Let 7/15 = 0.466, 15/23 = 0.652, 17/25 = 0.68 and 21/29 = 0.724
So, 0.724 is greatest and therefore, 21:29 is greatest.