Let the number of ice-cream serving the sisters can buy be "s".
Each serving is $2.80, so the cost of "s" ice-creams will be:
[tex]2.80s[/tex]This cost cannot exceed 10 dollars.
10 dollars is the maximum.
So, we can say that "2.80s" is equal to or less than 10.
We write it in inequality notation:
[tex]2.80s\leq10[/tex]Solving for "s":
[tex]\begin{gathered} 2.80s\leq10 \\ s\leq\frac{10}{2.80} \\ s\leq3.57 \end{gathered}[/tex]So, the logical solution is that the 5 sisters can buy 3 ice-cream servings with their budget.
