terrence's brother decided to share some pizza with terrence and his sister. if terrence ate 1/4 of the pizza, his brother ate 3/16 of the pizza, and altogether the three ate 5/8 of the pizza, how much did the sister eat?
1/4 + 3/16 + x = 5/8
4/16 + 3/16 + x = 10/16
x = 3/16