18 rows bricks below water and it rains after the rain there are 25 rows of bricks after 2 days of rain there are 6 rows of bricks below water how many more rows of bricks are below water after two days of rain than at the start

Kelly is a salesperson at a shoe store, where she must sell a pre-set number of pairs of shoes each month. at the end of each work day the number of pairs of shoes that she has left to sell that month is given by the equation s=300-15x , where s is the number of pair of shoes kelly still needs to sell and x is the number of days she has worked that month. what is the meaning of the number 300 in this equation