Ann's fish tank has 15 liters of water in it. She plans to add 6 liters per minute until the tank has at least 57 liters. What are the possible numbers of minutes Ann could add water

Answer 1

V = 6t + 15

57 ≤ 6t + 15

42 ≤ 6t

t ≥ 42 / 6

t ≥ 7 minutes