algebra 1A
posted by loraine .
a family travels to Bryce Canyon for three days. on the first day, they drive 150 miles. on the second day, they drive 190 miles. what is the least number of miles they drove on the third day if their average number of miles per day was at least 180?

Mean = Σx/n
180 = (150+190+x)/3
Solve for x.