Mixtures

6 )

A container contains 50 liters of milk. From this container 5 liters 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?

7 )

An alloy of platinum and silver weights 50 g. It contains 80% platinum. How much platinum should be added to the alloy so that percentage of platinum is increased to 90?

8 )

A trader sells total 315 coolers. He sells room cooler at a loss of 6% and desert cooler at a profit of 15% thus he gains 9% on the whole. What is the no. of room coolers which he has sold?

9 )

9. 4 kg of a material contains 1/5 cement and rest is sand. Another 5 kg of material contains 1/6 cement and rest is sand. The ratio of Cement and sand into the mixture of these two materials:

10 )

69 boxes (contain 100 marbles in each box) were divided among 115 kids so that each girl kid gets 50 marbles less than a boy kid. Thus each boy kid received twice the marbles as each girl kid received. The no. of girl kid is: