How much weight can I lose in 40 days?

Bubblemonster
Preferably girls, but guys too, how much weight could I lose in 40 days? My family is probably going on vacation 1 week after school is out, and I want to be able to look good in a bathing suit. I'm 5'3 148 pounds. I look a little bit less then my weight because I guess you can say "it's in the right places," but I want to get a flatter stomach and smaller thighs. Any suggestions on how I can do this? Past experiences would be great too. Thank you! (:
How much weight can I lose in 40 days?
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