Solve the portion 20/3 = ?/6

Steve is scuba diving near his home in maui. at one point he is 100 feet below the surface. represent this number with a negative number. if he descends another 5 feet, what negative number will represents his.

Aculture started with 3000 bacteria. after 5 hours it grew to 3900 bacteria. predict how many bacteria will be present after 9 hours

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?