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?
Grant has 4*90 = 
<gadget id="calculator">4*90</gadget>
<output>360</output>
360 vacations.
In total, they have 360 + 90 = 
<gadget id="calculator">360+90</gadget>
<output>450</output>
450 vacations and classes.

<result>450</result>