300mg of eq a week for 10 weeks will only give you 6-10lbs if you eat! I would up to 4-500mg if you are doing it alone or add 250-500mg of test. This sounds like your first cycle, so you wont need high doses to gain 20lbs. Diet is the deciding factor in any cycle, so make sure you plan out your diet and make sure it has plenty of protien in it.
Also knowing how to come off so that you keep the new muscle is key too.