Rachel had to complete 8 pages of math homework. If she had to complete 3 more pages of math homework than reading homework how many pages did she have to complete in all?
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1. Rachel had to complete 8 pages of math homework. 
2. If she had to complete 3 more pages of math homework than reading homework, that means she had to complete 3 less pages of reading homework. 
3. So if she had to complete 8 pages of math homework and 3 less pages of reading homework, that means in total she had to complete 8 + 3 = 11 pages of homework.