Question

why are pickles preserved by adding salt or oil

Answer 1

because the pickles are stored for a long time

Answer 2

Hey buddy

here is ur answer

"Also, by gobbling up the sugar, lactic acid bacteria remove a potential food source for bad bacteria. Adding salt to your pickling brine is one important way to help lactic acid bacteria win the microbial race ...what's more salt- tolerant yeasts can spread more quickly."

hope it helps u