Answer
Percentage of times that she goes to school by car = 41%
Explanation
It is given that Shelia walks to school 35% of the time and rides the bus 24% of the time.
Given that she only has 3 alternative ways to get to school (walking, taking the bus or going to school by car), it means the remaining of the time, she rides a car.
(Percentage of times that she walks to school) + (Percentage of times that she takes the bus) + (Percentage of times that she goes to school by car) = 100%
35% + 24% + (Percentage of times that she goes to school by car) = 100%
59% + (Percentage of times that she goes to school by car) = 100%
Percentage of times that she goes to school by car = 100% - 59%
Percentage of times that she goes to school by car = 41%
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