Rodrick mixes a martini that has a volume of 'n' ounces having 40% Vermouth and 60% Gin by volume. He wants to change it so that the martini is 40% Vermouth by volume. How many ounces of Gin must he add?  Choose the correct choice from the following:
A) 0
B) n/3
C) 3n/5
D) 5n/6
E) 8n/5
4 ounces is vermouth   6 ounces of gin...   Total volume 10.   To make vermouth account for 40% of total volume the new volume must be....   x*0.4=4   x=10 ounces....   So now you see that he must add 0 ounces of gin...   Plug in 0 for n in the answer choices and look for answer 0   0
<result>A</result>
Rodrick mixes a martini that has a volume of 'n' ounces having 40% Vermouth and 60% Gin by volume. He wants to change it so that the martini is 40% Vermouth by volume. How many ounces of Gin must he add?