Answer:
The answer to your question is: when x = 100 days, y = 34 m³
Step-by-step explanation:
Data
Volumen = 61 m³
Loses 0.27 m³ each day
Equation   y + 0.27x = 61
when x = 100, y = ?
Process, just substitute x in the equation and solve it for y
         y + 0.27(100) = 61
         y + 27 = 61
         y = 61 - 27
         y = 34 m³
It means that after ten days, the swimming pool will only have 34 m³, because 27 m³ will have evaporated.
