Sam and Drew have a combined age of 54. Sam is half of Drew's age. How old is Sam?
Let x be Drew's age.
Sam is (1/2)x
x+(1/2)x=54
(3/2)x=54
3x=108
x=
<gadget id="calculator">36</gadget>
<output>36</output>
36.
Sam is 36/2=
<gadget id="calculator">36/2</gadget>
<output>18</output>
18 years old.

<result>18</result>