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 = 
<gadget id="calculator">3*6</gadget>
<output>18</output>
18 books.
This month Williams read twice 8 books for a total of 2*8 = 
<gadget id="calculator">2*8</gadget>
<output>16</output>
16 books.
Across the 2 months Brad has read 18+8 = 
<gadget id="calculator">18+8</gadget>
<output>26</output>
26 books.
Across the 2 months William has read 6+16 = 
<gadget id="calculator">6+16</gadget>
<output>22</output>
22 books.
Brad has read 26-22 = 
<gadget id="calculator">26-22</gadget>
<output>4</output>
4 more books.

<result>4</result>