<gadget id="calculator">45 + 30</gadget>
<output>75</output>

<result>75</result>
Marvin had some blackcurrant. William took 30 from him. Now Marvin has 45 blackcurrant. How many blackcurrant Marvin had to begin with?
Marvin had some blackcurrant. William took 30 from him. Now Marvin has 45 blackcurrant. How many blackcurrant Marvin had to begin with?