The lifespan of an orangutan is 50 years, which is 10 years more than twice the lifespan of a giant panda. How long is the lifespan of a giant panda?
猩猩的寿命为50年，比大熊猫的寿命的2倍多10年，大熊猫的寿命是多少年？
<gadget id="calculator">50 - 10</gadget>
<output>40</output>

<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<result>20</result>