math problem of the day

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Offline jas_fluidm

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math problem of the day
« on: July 10, 2013, 12:54:39 PM »
Pat, kate and mark charged a total of 162 hours to 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?

Ans: 90 hours