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 10% Vermouth by volume. How many ounces of Gin must he add?
Answers.
A) n/6
B) n/3
C) 3n/5
D) 5n/6
E) 8n/4
4 ounces is vermouth   6 ounces of gin...   Total volume 10.   To make vermouth account for 10% of total volume the new volume must be....   x*0.1=4   x=40 ounces....   So now you see that he must add 30 ounces of gin...   Plug in 15 for n in the answer choices and look for answer 30   8n/4
<result>E</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 10% Vermouth by volume. How many ounces of Gin must he add?