A pizza can be cut into 8 slices. Alex ate one whole pizza and three slices of the other pizza. Shalini ate 6 slices. How much pizza did they all eat in total?

The correct option is D 2$\frac{1}{8}$
A pizza can be cut into 8 slices.
Alex ate one whole pizza and three slices of the other pizza. i.e, 1$\frac{3}{8}$
Shalini ate 6 slices. i.e, $\frac{6}{8}$
Total pizza they all eat = 1$\frac{3}{8}$ + $\frac{6}{8}$
$=1+\frac{3}{8}+\frac{6}{8}=1+\frac{9}{8}=1+1+\frac{1}{8}=2\frac{1}{8}$