A 6 litre sol is 30% alcohol .How many litres of pure alcohol must be added to produce a sol that is 50% alcohol ?
Select:	A) a . 0.6	B) b . 1	C) c . 2.1	D) d . 3	E) e . 2.4

Rationale: 30 % of 6 = 1.8 50 % of 6 = 3 shortage is 1.2 so we need to have 1.2 / 50 % to get 50 % alcohol content . = 2.4 e
Answer: E