<human>:  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?
<bot>: How many books did Brad read last month? ** Last month Brad read thrice 6 books for a total of 3*6 = <<3*6=18>>18 books
How many books did Williams read this month? ** This month Williams read twice 8 books for a total of 2*8 = <<2*8=16>>16 books
How many books did Brad read across the two months? ** Across the 2 months Brad has read 18+8 = <<18+8=26>>26 books
How many books did William read across the two months? ** Across the 2 months William has read 6+16 = <<6+16=22>>22 books
How many more books did Brad read than William? ** Brad has read 26-22 = <<26-22=4>>4 more books
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