During a sale a bookstore sold 1/2 of all its books in stock. on the following day the bookstore sold 4000 more books. now oly 1/10 of the books in stock before the sale are remaining in the store. how many books were in stock before the sale

How should the syntax in this sentence be changed, if at all? the scientists spent years analyzing the results of numerous medical studies meant to identify the cause of the disease. no change the scientists spent years looking at the results of a variety of different medical studies meant to locate the cause of the disease. the scientists spent years reviewing medical study results to find the cause of the disease. the scientists spent years studying the results of many medical studies in order to uncover the cause of the disease.