We can find the number of trays that kate needs to use by dividing the total number of muffins that she baked by the number that each tray can hold, if the result is a decimal number, we must round it to a greater or equal integer.
We can do it like this:
[tex]\frac{84}{9}=9\hat{.3}[/tex]Since we got 9.3, we round it to 10, then Kate used 10 trays
