Q1. 
A 20 litre mixture of milk and water contains milk and water in the ratio 3 : 2. 10 litres of the mixture is removed and replaced with pure milk and the operation is repeated once more. At the end of the two removals and replacement, what is the ratio of milk and water in the resultant mixture? 
A.  17 : 3 

B.  9 : 1 

C.  3 : 17 

D.  5 : 3 
Q2. 
How many kgs of Basmati rice costing Rs.42/kg should a shopkeeper mix with 25 kgs of ordinary rice costing Rs.24 per kg so that he makes a profit of 25% on selling the mixture at Rs.40/kg? 
A.  20.0 kgs 

B.  12.5 kgs 

C.  16.0 kgs 

D.  200.0 kgs 
Q3. 
In what ratio must a person mix three kinds of wheat costing him Rs 1.20,Rs 1.44 and Rs 1.74 per Kg so that the mixture may be worth Rs 1.41 per Kg? 
A.  11 : 77 : 7 

B.  25 : 45 : 8 

C.  27 : 23 : 6 

D.  11 : 45 : 7 
Q4. 
How many litres of water should be added to a 30 litre mixture of milk and water containing milk and water in the ratio of 7 : 3 such that the resultant mixture has 40% water in it? 
A.  5 litres 

B.  7 litres 

C.  10 litres 

D.  None of these 
Q5. 
A sample of $x$ litres from a container having a 60 litre mixture of milk and water containing milk and water in the ratio of 2 : 3 is replaced with pure milk so that the container will have milk and water in equal proportions. What is the value of $x$? 
A.  6 litres 

B.  10 litres 

C.  30 litres 

D.  None of these 