5/4 or 1 1/4 cans
Explanation
Step 1
let
Rover eats 3/4 of a can of cat food each day
Bobo eats 1/2 of a can of cat food each day.
hence, the total cat food per day is the sum of rover and bobo's
[tex]\text{total per day= }\frac{3}{4}\frac{can}{\text{day}}+\frac{1}{2}\frac{can}{\text{day}}[/tex]Step 2
add the fraction numbers
remember:
[tex]\frac{a}{b}+\frac{c}{d}=\frac{ad+bc}{bd}[/tex]so
[tex]\begin{gathered} \frac{3}{4}+\frac{1}{2}=\frac{6+4}{8}=\frac{10}{8} \\ \text{simplify} \\ \frac{10}{8}\rightarrow\frac{5}{4}\text{ }\rightarrow\frac{4}{4}+\frac{1}{4}=1\text{ }\frac{1}{4} \end{gathered}[/tex]I hope this helps you