Who knows ninety?
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Every Jew who left Mitzrayim had at least 90 donkeys loaded with silver and gold from the Egyptians. This is given as one possible reason why firstborn donkeys, unlike other non-kosher animals, are subject to the mitzvah of Pidyon Petter Chamor. (Bechoros 5b)
(The meforshim discuss the apparent hyperbolic nature of the Gemara's statement.)
According to the original Torah law, a Jewish farmer need give "only one grain of wheat" for terumah, and 10% of the crop to the Levi for maaser rishon. He thus ends up keeping 90 percent of the produce in most years.
(By Rabbinical law, the minimum amount for terumah is 1/60 of the crop, with 1/50 being the average and 1/40 being a more generous amount. He therefore keeps about 88 percent.)
representing the Hebrew letter tsadii, the first letter of the word tsadik- (righteous) why does this word start with this letter one reason we learn is that the because of merit of the rightous this world is existing, if we look at the letter tsadii it is a letter nun bent over with a yud atop as are the rightous bent over to carry unto themselves the burden of the yisroel which begins with yud.