Weight loss!

I am going with a friend to his prom because he couldn't find a date... I figured I could wear one of my high school dresses (I'm in college now). I have to because I don't have the money to buy a new one. The thing is I put on the freshman 15 plus 5 and the dress doesn't fit. So I need to lose about 20 pounds in 6 weeks... is this doable? For those of you with experience, do you have any tips to make this happen? I don't have a whole lot of extra time to spend in the gym between school and work but I can go about an hour a day. What else can I do? Thanks!
Weight loss!
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