Q6. 
From a cask of milk containing 30 litres, 6 litres are drawn out and the cask is filled up with water. If the same process is repeated a second, then a third time, what will be the number of litres of milk left in the cask? 
A.  5.12 litres 

B.  12 litres 

C.  14.38 litres 

D.  15.36 litres 
Q7. 
A zookeeper counted the heads of the animals in a zoo and found it to be 80. When he counted the legs of the animals he found it to be 260. If the zoo had either pigeons or horses, how many horses were there in the zoo? 
A.  30 

B.  40 

C.  50 

D.  60 
Q8. 
How many litres of a 12 litre mixture containing milk and water in the ratio of 2 : 3 be replaced with pure milk so that the resultant mixture contains milk and water in equal proportion? 
A.  1.0 litres 

B.  1.5 litres 

C.  2.0 litres 

D.  4.0 litres 
Q9. 
A merchant mixes three varieties of rice costing Rs.20/kg, Rs.24/kg and Rs.30/kg and sells the mixture at a profit of 20% at Rs.30 / kg. How many kgs of the second variety will be in the mixture if 2 kgs of the third variety is there in the mixture? 
A.  1 kg 

B.  3 kgs 

C.  5 kgs 

D.  6 kgs 
Q10. 
In what ratio must a person mix three kinds of tea costing Rs.60/kg, Rs.75/kg and Rs.100 /kg so that the resultant mixture when sold at Rs.96/kg yields a profit of 20%? 
A.  1 : 2 : 4 

B.  3 : 7 : 6 

C.  1 : 4 : 2 

D.  None of these 