The mother squirrel plans to save 80 pine cones for the winter, and has already saved 50, and will save 5 more every day, but the little squirrel will quietly eat 2 of them every day. How many days will it take to save 80?
松鼠妈妈打算存80个松果过冬，已经存了50个，接下来每天还要再存5个，可是小松鼠每天会悄悄吃掉2个．这样还要多少天才能存满80个．
<gadget id="calculator">80 - 50</gadget>
<output>30</output>

<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">30 / 3</gadget>
<output>10</output>

<result>10</result>