Here's a question on my GMAT study book that I really don't know how to figure out...

Could someone show me HOW to work this out? And/Or the most effective way to figure it out?

2 3

if --- + --- = 4 and xy = 5, then 3x + 2y = ?

x y

crap, the formatting isn't there...

try this

if (2/x) + (3/y) = 4 and xy = 5, then 3x + 2y