In an examination 25% students Passed in civics and 20% in history, 40% passed in both of these subjects. If 90 students failed in history and Civics both, then what is the total number of students.

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.