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 how many pages of math and biology homework Rachel had to complete. We know that she had to complete 8 pages of math homework and 3 pages of biology homework, so the total number of pages of math and biology homework she had to complete is 8 + 3, which is 11. 

Therefore the answer (numeric) is: 

11