The mother rabbit has picked 200 mushrooms, and has eaten 40 of them. The rest of the mushrooms will be eaten in 8 days. How many mushrooms are eaten per day on average?
兔妈妈采了200个蘑菇，已经吃了40个，剩下的蘑菇要8天吃完，平均每天吃多少个？
<gadget id="calculator">200 - 40</gadget>
<output>160</output>

<gadget id="calculator">160 / 8</gadget>
<output>20</output>

<result>20</result>