Questions on Mixture replaces with water

The ratio of milk and water is 7:3 .How much amount of the mixture should be replaced with water so that the amount of milk and water becomes equal in the vessel ?

A vessel contains 400 ltmilk. 20 ltof milk was replaced by water and then 40 ltof the resu lt ant mixture was replaced by water. Find the ratio of milk and water in result ant mixture.

A container is filled with liquid, 6 part of which are water 10 part milk. How much of the mixture must be drawn off and replaced with water so that the mixture may be half water and half milk?

A vessel is filled with liquid,3 parts of which are water and 5parts syrup.How much of the mixture must be drawn off and replaced with water so that the mixture may be half water and half syrup? (1)/(3) (b) (1)/(4) (c) (1)/(5) (d) (1)/(7)

The diluted wine contains only 8 litres of wine and the rest is water. A new mixture whose concentration is 30%, is to be formed by replacing wine. How many litres of mixture shall be replaced with pure wine if there was initially 32 litres of water in the mixture ?