In order to figure this out you have to divide by the size of the slices to find the number. since dividing by a fraction is the same as multiplying by the reciprocal(the opposite, flipping the fraction) we can determine that there are 24 1/2 in. slices.
How many students would there be? did not see that information if that is the question but if not I say go with the bus that has more seats yes it is more expensive but more space is better!