Answer:
1 1/8 pizza (or 1 whole pizza and 1 eighth of a pizza)
Explanation:
There is 1 whole pizza and 4 eighth's of a pizza.
If Sara eats 3 of those eighth's, only 1 eighth will remain (as well as the untouched whole pizza).

Answer: 1 1/8 pizza (or 1 whole pizza and 1 eighth of a pizza)