6. 

A dishonest milkman professes to sell his milk at cost price but he mixes it with water and thereby gains 25%. The percentage of water in the mixture is:

A. 4%
B. 6 %
C. 20%
D. 25%

7. 

A container contains 40 litres of milk. From this container 4 litres of milk was taken out and replaced by water. This process was repeated further two times. How much milk is now contained by the container?

A. 26.34 litres
B. 27.36 लीटर
C. 28 लीटर
D. 29.16 लीटर

8. 

A jar full of whisky contains 40% alcohol. A part of this whisky is replaced by another containing 19% alcohol and now the percentage of alcohol was found to be 26%. The quantity of whisky replaced is:

A.
1
3
B.
2
3
C.
2
5
D.
3
5

9. 

In what ratio must water be mixed with milk to gain 16% on selling the mixture at cost price?

A. 1 : 6
B. 6: 1
C. 2: 3
D. 4: 3

10. 

Find the ratio in which rice at Rs. 7.20 a kg be mixed with rice at Rs. 5.70 a kg to produce a mixture worth Rs. 6.30 a kg.

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