Ruel has four books of 10 stamps, so he has 4 x 10 = 40 stamps from those books.
Ruel also has six books of 15 stamps, so he has 6 x 15 = 90 stamps from those books.
Therefore, Ruel has a total of 40 + 90 = 130 stamps.
#### 130
The answer is: 130
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Ruel has four books of 10 stamps and six books of 15 stamps. How many stamps does Ruel have?

### Answer:
