How many article in one blog on blogspot that can make that's blog provide significant earning rating. around 100 article ? . I want around 5-10 $ perday.
it si not the number, but the quality and frequent updates.. should not be copy paste...the older your blog, better results. if you do not have adsense approved account, go for other networks like adbrite if you have significant US traffic..
The number of posts doesn't matter. Just make sure to update every few days with relevant content that will help people and Google will reward you with SERPs (and if you use adsense, $$).
It also depends on how you monetize the blogs. You cannot earn much if you only rely on Google Adsense. Try to explore other ways to complement the income from Google Adsense.