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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
View Answer
Answer: option (B)
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
View Answer
Answer: option (B)
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
View Answer
Answer: option (B)
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
View Answer
Answer: option (C)
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
View Answer
Answer: option (D)
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.