Audrey is 7 years older than Heracles. In 3 years, Audrey will be twice as old as Heracles is now. How old is Heracles now?
Since Audrey is older than Heracles by 7 years, in 3 years he will be 10 years older than Heracles' current age.
In 3 years he will be double Heracles' current age 10 * 2 = 
<gadget id="calculator">10*2</gadget>
<output>20</output>
20.
Heracles is 
<gadget id="calculator">10</gadget>
<output>10</output>
10.

<result>10</result>