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 ?
"85 all u do is do 2 : 1 : 6 = > 2 x + x + 6 x = 153 = > x = 17 34 : 17 : 102 102 - 17 = 85 answer a"
subtract(divide(153, add(add(1, divide(1, 3)), divide(1, multiply(3, const_2)))), divide(divide(153, add(add(1, divide(1, 3)), divide(1, multiply(3, const_2)))), multiply(3, const_2)))