If a mixture is 1⁄7 alcohol by volume and 2⁄7 water by volume, what is the ratio of the volume of alcohol to the volume of water in this mixture?
Choose the correct choice from the following options:
A) 4 / 2  B) 3 / 2  C) 1 / 2  D) 5 / 2  E) 7 / 2

Rationale: "should be a sub - 600 level q . . volume = { 1 / 7 } / { 2 / 7 } = 1 / 2 c"
Answer: C