Can someone help me with number 20 the answer is x < 1 and x > 12 but can someone explain how to solve this with words cause I need to explain how I got the answer and I don’t know how give an explanation

Boris needs to buy plastic spoons. brand a has a box 42 spoons for $2.37. brand b has a box of 72 spoons for $3.57. find the unit price for each brand. then state which brand is the better buy based on the unit price. round your answer to the nearest cent.