837 total
they sold 5/9 at normal price
5/9(837) = 4185/9 = 465 were sold at normal price
they sold 3/4 of the remaining ones.....remaining ones are : (837 - 465) =
372.....so they sold (3/4 * 372) = 1116/4 = 279 at a discount price
so after the discount ones were sold, they had (837 - 465 - 279) = 93 remaining