Adam really wants to ride the biggest roller coaster at the park. You have to be 4 feet tall to ride it. Adam’s height is 40 inches and he grows 2 inches a year. How many years until he is tall enough to ride it?
Adam needs to grow 8 inches because 48 -40= 
<gadget id="calculator">48-40</gadget>
<output>8</output>
8.
It will take 4 years because 8/2=
<gadget id="calculator">8/2</gadget>
<output>4</output>
4.

<result>4</result>