Rachel had to complete 8 pages of math homework, 7 pages of reading homework and 3 more pages of biology homework. How many pages of math and biology homework did she have to complete?
First, we need to find out how many pages of math and biology homework Rachel had to complete. 

We know that Rachel had to complete 8 pages of math homework and 3 pages of biology homework. 

That means she had to complete 11 pages of math and biology homework in total.