Direction: The following question consists of three statements numbered I, II and III. Decide if data given in the statements are sufficient to answer the questions below.

A mixture contains alcohol and water. How much water is required to be mixed with 500 ml of alcohol?

I) 100 ml of mixture contains 20 ml of water.

II) 400 ml of mixture contains 320 ml of alcohol.

III) The mixture contains alcohol and water in the ratio 4 : 1.