The swimming pool is 50 meters long. I swim 8 times each time. How many meters do I swim each time?
游泳池长50米，我每次都游8个来回，我每次游多少米．
<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<gadget id="calculator">50 * 16</gadget>
<output>800</output>

<result>800</result>