Pat, Kate, and Mark charged a total of 153 hours to a certain project. If Pat charged twice as much time to the project as Kate and 1/3 as much time as Mark, how many more hours did Mark charge to the project than Kate?
Choices: A) 85 B) 36 C) 72 D) 90 E) 108
85   all u do is do   2:1:6=&gt;2x+x+6x=153=&gt;x= 17   34:17:102   102-17= 
<gadget id="calculator">102-17</gadget>
<output>85</output>
85   85nswer 85
<result>A</result>
Pat, Kate, and Mark charged a total of 153 hours to a certain project. If Pat charged twice as much time to the project as Kate and 1/3 as much time as Mark, how many more hours did Mark charge to the project than Kate?