human
Ruel has four books of 10 stamps and six books of 15 stamps. How many stamps does Ruel have?
assistant
How many stamps does Ruel have from the four books? ** Ruel has a total of 4 x 10 = <<4*10=40>>40 stamps from the four books.
How many stamps does Ruel have from the six books? ** He also has 6 x 15 = <<6*15=90>>90 stamps from the six books.
How many stamps does Ruel have? ** Therefore, he has a total of 40 + 90 = <<40+90=130>>130 stamps.
#### 130