3
Q:

If x is the mean proportional between 12.8 and 64.8 and y is the third proportional to 38.4 and 57.6, then 2x : y is equal to:

 

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

Answer:   A) 2 : 3



Explanation:
Q:

Three numbers are in the ratio 1/4 : 5/9 : 7/12, The difference between the greatest and the smallest number is 180, Find the sum of all the three numbers.

 

A) 650 B) 800
C) 500 D) 750
 
Answer & Explanation Answer: D) 750

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1 54
Q:

How much will be decreased to each terms of ratio 16 : 19, so that it will be 7 : 6?

 

A) 36 B) 35
C) 34 D) 37
 
Answer & Explanation Answer: D) 37

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0 59
Q:

A's salary increases in the ratio 8 : 11. If his new salary is ₹33,000, then what was his original salary (in ₹)?

 

A) 20,000 B) 18,000
C) 22,000 D) 24,000
 
Answer & Explanation Answer: D) 24,000

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2 571
Q:

If 25, 35 and p are in continued proportion, then the value of p is ...........

 

A) 60 B) 75
C) 49 D) 50
 
Answer & Explanation Answer: C) 49

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0 84
Q:

What is the ratio of the mean proportional between 4.8 and 10.8 and the third proportional to 0.4 and 2.4?

 

A) 2 : 1 B) 3 : 2
C) 1 : 2 D) 2 : 3  
 
Answer & Explanation Answer: C) 1 : 2

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2 169
Q:

If a : b = 5 : 3, then (8a — 5b) : (8a + 5b) is equal to:

 

A) 2:5 B) 3:11
C) 5:11 D) 3:13
 
Answer & Explanation Answer: C) 5:11

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2 159
Q:

If a : b = 5 : 8 and c : b = 4 : 3, then a : b : c is equal to:

 

A) 15 : 24 : 32 B) 15 : 24 : 28
C) 5 : 6 : 8 D) 5 : 8 : 6
 
Answer & Explanation Answer: A) 15 : 24 : 32

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1 221
Q:

The ratio of the number of boys to the number of girls in a school of 640 students, is 5 : 3. If 30 more girls are admitted in the school, then how many more boys should be admitted so that the ratio of boys to that of the girls, becomes 14 : 9.

 

A) 30 B) 25
C) 15 D) 20
 
Answer & Explanation Answer: D) 20

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2 361