Charmaine will be 16 years old in 12 years. How old will she be 4 years from now?
Charmaine's present age is 16 - 12 = 
<gadget id="calculator">16-12</gadget>
<output>4</output>
4 years old.
So she will be 4 + 4 = 
<gadget id="calculator">4+4</gadget>
<output>8</output>
8 years old 4 years from now.

<result>8</result>