Given is :
Let the total number of sparkling cans of water used in a day be =x
As mentioned, the family uses more than 15 cans each day so inequality becomes , [tex]x>15[/tex]
As they buy cases of water with 24 cans in each case. So less than 1 case is used in a day.
Number of cans used in a day is more than 15, so approx number of cans used in 30 days will be = [tex]30\times15=450[/tex]
As each case contains 24 cans, so the number of cases that will contain 450 cans will be, [tex]\frac{450}{24}=18.75[/tex] cases. Rounding this off to nearest whole number, we get 19 cases.
Hence, the family buys around 19 cases of sparkling water in 30 days.
