A 6 litre sol is 20% alcohol .How many litres of pure alcohol must be added to produce a sol that is 50% alcohol ?  Options.
A) A.0.6 B) B.1 C) C.2.1 D) D.3.6 E) E.5.4
20% of 6 = 1.2   50% of 6 = 3   shortage is 1.8   so we need to have 1.8/50% to get 50% alcohol content.   = 3.6 D.3.6
<result>D</result>
A 6 litre sol is 20% alcohol .How many litres of pure alcohol must be added to produce a sol that is 50% alcohol ?