Lena's fish tank has 19 liters of water in it. she plans to add 4 liters per minute until the tank has at least 43 liters. what are the possible numbers of minutes lena could add water?

We are going to define a variable to solve the problem.
 x: amount of time in munites
 The inequality in this case is given by:
 4x + 19> 43
 Clearing x we have:
 4x> 43-19
 4x> 24
 x> 24/4
 x> 6
 
 the possible numbers of minutes lena could add water is:
 x> 6 minutes

7.236, 7.263, 7.326,7.462,7,63