Question: Peter has 20 books. He has read 40% of them. His brother has read 10% of them. How many more of these books has Peter read than his brother? Think carefully first, then make a decision:
Peter has read 8 of these books because 20 x .4 = 8. His brother has read 2 of these books because 20 x .1 = 2. Peter has read 6 more books than his brother because 8 - 2 = 6. So the answer is 6.