Since the whole pizza costs 9.30 and Jose pays for 2/3.
Let's divide the money by 3 since the Jose will pay for 2/3.
9.30/3 is 3.1 or $3.10
Now since we know that $3.10 is for each 1/3.
Just add 3.10+3.10
And that is $6.20
So Jose will pay $6.20 for 2/3 of the pizza.