Human: 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? Assistant: 
How many vacations does Grant have? ** Grant has 4*90 = <<4*90=360>>360 vacations.
How many vacations and classes do Grant and Kelvin have altogether? ** In total, they have 360 + 90 = <<360+90=450>>450 vacations and classes.
#### 450