286
Q:

A can contains a mixture of two liquids A and B in the ratio  7 : 5. When 9 litres of mixture are drawn off and the can is filled with B, the ratio of A and B becomes 7 : 9. How many litres of liquid A was contained by the can initially?

 A) 10 B) 20 C) 21 D) 25

Explanation:

Suppose the can initially contains 7x and 5x litres of mixtures A and B respectively

Quantity of A in mixture left =$7x-712×9=7x-214$ litres.

Quantity of B in mixture left =  $5x-512×9=5x-154$litres.

$7x-2145x-154+9=79$

$⇒28x-2120x+21=79$

$⇒x=3$

So, the can contained 21 litres of A.

Q:

Six cubes, each of edge 2 cm, are joined end to end. What is the total surface area of the resulting cuboid in cm^2?

 A) 96 B) 144 C) 104 D) 128

Explanation:

1 274
Q:

In a mixture of 165 litres, the ratio of liquids X and Y is 6 : 5. If 5 litres of liquid Y is added in the mixture, then what is the ratio of X and Y in the new mixture?

 A) 10 : 9 B) 8 : 7 C) 9 : 8 D) 5 : 4

Explanation:

1 791
Q:

25 litres of a mixture contains 30% of spirit and rest water. If 5 litres of water be mixed in it, the percentage of spirit in the new mixture is

 A) 45% B) 33 1/3% C) 25 % D) 12 1/2%

Explanation:

5 713
Q:

The ratio of sand to gravel in a mixture is 17 : 9 while that between gravel and cement is 6 : 17. What is the ratio of sand to cement in the mixture?

 A) 289 : 54 B) 9 : 6 C) 17 : 17 D) 2 : 3

Explanation:

2 646
Q:

Rahul adds 2 litres of alcohol in 6 litres of water and Dinesh adds 1 litres of alcohol in 9 litres of water. What is the ratio of the percentage of alcohol in the two mixtures?

 A) 7 : 4 B) 2 : 1 C) 5 : 2 D) 8 : 3

Explanation:

6 754
Q:

In what ratio salt costing Rs 13/kg mixed with another salt costing Rs 7/ kg to get a mixture costing Rs 9/kg?

 A) 4 : 7 B) 3 : 5 C) 2 : 3 D) 1 : 2

Explanation:

3 555
Q:

In an alloy of German silver. the ratio of copper to zinc was 21 : 16 while that of nickel to zinc was 7 : 24. What was the ratio of copper to zinc to nickel in the alloy?

 A) 21 : 16 : 7 B) 17 : 21 : 4 C) 63 : 48 : 14 D) 68 : 28 : 21

Explanation:

5 1611
Q:

Vipin adds 3 litres of liquid A in 6 litres of liquid B and Mohit adds 8 litres of liquid A in 15 litres of liquid B. What is the ratio of the percentage of liquid B in the two mixtures?

 A) 26 : 25 B) 51 : 32 C) 46 : 45 D) 34 : 25