sally found a wallet while walking down the street and it contained 11 bills in total the wallet only had $5 bills $10 bills and $20 dollar bills in it the total value of bills was $115 and the total amount of the $5 and $10 was $75.Can yall give me the 3 equations

Liz is shipping a package to her friend. the maximum weight of a medium flat-rate box is 20 pounds, including the box which weighs 6 ounces. write and solve an inequality to describe the possible weight in pounds, w, of the contents that liz will ship to her friend if she must use a medium flat-rate box. use the drop-down menus to explain your answer.