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 80% Vermouth by volume. How many ounces of Gin must he add?  Choose the correct choice from the following options:  A) n/6  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 80% of total volume the new volume must be....   x*0.8=4   x=5 ounces....   So now you see that he must add 5 ounces of gin...   Plug in 6 for n in the answer choices and look for answer 5   5n/6
<result>D</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 80% Vermouth by volume. How many ounces of Gin must he add?