Pat, Kate, and Mark charged a total of 135 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?
Choose the correct choice from the following answers:
A) 18
B) 36
C) 75
D) 90
E) 108
75   all u do is do   2:1:6=&gt;2x+x+6x=135=&gt;x= 15   30:15:90   90-15= 
<gadget id="calculator">90-15</gadget>
<output>75</output>
75   Answer 75
<result>C</result>
Pat, Kate, and Mark charged a total of 135 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?