I'll give you a question, please answer with step-by-step reasoning process.
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?

6
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.

.

The answer is 6