Jessica combines 1/3 cups of blue paint and 1/2 cups of red paint.

What’s the question

There is more red paint

There is now 5/6 of a cup of paint if they are mixed

The total amount of different books is 16.

Take away 1 from each, representing the same book they all read.

7 - 1 = 6 , 6 - 1 = 5 , 5 - 1 = 4

Add the three together.

6 + 5 + 4 = 15

Add that one book everyone read.

15 + 1 = 16 different books.

Hope I helped you out.