Resolved Question: how many pounds can I lose with watermelon diet?

Please tell me if I follow only fresh watermelon juice/fruit diet for about 9 days how many pounds can I lose ? I am also planning on drinking at least 3-4 cups of oolong/wulong green tea....
Please don't tell me it is unhealthy...I am desperate to lose weight ....please suggest....
I need to lose anywhere b/w 10-20 pounds