Two brothers went shopping at a back-to-school sale where all shirts were the same price, and all the shorts too. the younger brother spent $76 on 8 new shirts and 3 pairs of shorts. the older brother purchased 3 new shirts and 9 pairs of shorts and paid a total of $123. how much did each item cost?

Two farmers pay a total rent of $140 for a pasture. the first farmer placed $4 oxen in the pasture, and the second farmer placed $30 sheep in the pasture. the farmers split the rent based on the proportion of the pasture eaten by their own animals that month. how much should the first farmer pay, if 1 ox eats as much as 10 sheep in a month?