Kyle and his three friends are all saving money to go on a trip. They each have $20 saved. How much money will they each need to save in order to have at least $400 in all to go on a trip?

Mallory has been offers two different jobs. she can baby sit for 6 hours a week and get $8.50 an hour. or she can work at the library for 14 hours a week and make $5.50 an hour. which job will allow her to save the most money after 6weeks?