Question

Charmaine's fish tank has 19 liters of water in it. She plans to add 6 liters per minute until the tank has at least 49 liters. What are the possible numbers of

minutes Charmaine could add water?
Use t for the number of minutes.
Write your answer as an inequality solved for t.

Answer 1

t ≥ 5

Explanation:

In the tank now: 19

Fill rate per minute: 6

Number of minutes: t

Amount filled in t minutes: 6t

Total amount in tank after t minutes: 6t + 19

Amount desired: at least 49 liters

At least 49 liters means "greater than or equal to 49"

Inequality:

6t + 19 ≥ 49

Subtract 19 from both sides.

6t ≥ 30

Divide both sides by 6.

t ≥ 5