Give the step-by-step reasoning process and then the final answer. Grant has four times as many vacations as Kelvin has classes. If Kelvin has 90 classes, how many vacations and classes do Grant and Kelvin have altogether?
User
Grant has 4 * 90 = 360 vacations. In total, they have 360 + 90 = 450 vacations and classes.
The final answer: 450.
Assistant