348
Q:

A mixture contains alcohol and water in the ratio 4 : 3. If 5 liters of water is added to the mixture, the ratio becomes 4: 5. Find the quantity of alcohol in the given mixture.

A) 10 B) 12
C) 15 D) 18

Answer:   A) 10



Explanation:

Let the quantity of alcohol and water be 4x litres and 3x litres respectively

 

4x/(3x+5) = 4/5 

 

20x = 4(3x+5)

 

8x = 20

 

x = 2.5

 

Quantity of alcohol = (4 x 2.5) litres = 10 litres.

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

Explanation:
Report Error

View Answer Report Error Discuss

0 75
Q:

If the base radius of 2 cylinders are in the ratio 3 : 4 and their heights are in the ratio 4 : 9, then the ratio of their volumes is:

 

A) 2:1 B) 1:4
C) 1:2 D) 4:1
 
Answer & Explanation Answer: B) 1:4

Explanation:
Report Error

View Answer Report Error Discuss

0 16
Q:

If a : b = 2 : 3 and c : b = 5 : 6, then a : b : c is equal to:

 

A) 10 : 15 : 18 B) 6 : 9 : 16
C) 4 : 6 : 5 D) 6 : 9 : 12
 
Answer & Explanation Answer: C) 4 : 6 : 5

Explanation:
Report Error

View Answer Report Error Discuss

0 42
Q:

If a : b = 2 : 5, c: b = 3 : 4, then a : b : c is equal to:

 

A) 2 : 5 : 4 B) 6 : 15 : 20
C) 2 : 5 : 3 D) 8 : 20 : 15
 
Answer & Explanation Answer: D) 8 : 20 : 15

Explanation:
Report Error

View Answer Report Error Discuss

0 368
Q:

Two numbers are in the ratio 5 : 7. If the first number is 20, then the second number will be:

 

A) 8 B) 22
C) 28 D) 18 
 
Answer & Explanation Answer: C) 28

Explanation:
Report Error

View Answer Report Error Discuss

3 398
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 & Explanation Answer: A) 2 : 3

Explanation:
Report Error

View Answer Report Error Discuss

3 323
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 & Explanation Answer: A) 2 : 3

Explanation:
Report Error

View Answer Report Error Discuss

2 472
Q:

If the radius of the circumcircle of an equilateral triangle is 8 cm, then the measure of radius of its incircle is:

 

A) 16cm B) 4cm
C) 12cm D) 8 cm
 
Answer & Explanation Answer: B) 4cm

Explanation:
Report Error

View Answer Report Error Discuss

1 339