i had got tried before more set and more reps. But the only problem is, which weight you should stick to?

It is really weird as i did it on push up, 35repsx6 and then 20repsx10. My chest muscle is like kind of toning up but the tricep and shoulder is getting bigger and more solid. But it require you to do it from 3 times per week and the reps and sets are keep on increasing until the stage where you will need to push 400 times.