If Ann is 9 years old and her brother is twice her age, how old will her brother be in 3 years?
Ann's brother is 9 * 2 = 
<gadget id="calculator">9*2</gadget>
<output>18</output>
18 years old now.
This means, in 3 years, her brother will be 18 + 3 = 
<gadget id="calculator">18+3</gadget>
<output>21</output>
21 years old.

<result>21</result>