Wednesday, September 22, 2010

Pat, Kate and Mark charged a total of 162 hours to a certain project. If Pat charged twice as much 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?
A. 18
B. 36
C. 72
D. 90
E. 108






P:K:M = 2x:1x:6x
Hence 9x = 162 .......x = 18
M-K = 90
Ans : D

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