William read 6 books last month and Brad read thrice as many books as William did. This month, in an effort to catch up, Williams read twice as much as Brad, who read 8 books. Who has read more across the two months, and by how much?
Last month Brad read thrice 6 books for a total of 3*6 = <T>multiply(3, 6)=18 books
This month Williams read twice 8 books for a total of 2*8 = <T>multiply(2, 8)=16 books
Across the 2 months Brad has read 18+8 = <T>add(18, 8)=26 books
Across the 2 months William has read 6+16 = <T>add(6, 16)=22 books
Brad has read 26-22 = <T>subtract(26, 22)=4 more books
