The courier company delivered 20 flower pots to the flower shop. Agreed: pay 8 yuan for the shipping fee for each intact flowerpot, and pay 12 yuan for each damaged flowerpot without shipping fee. As a result, the courier company received 100 yuan, and how many flower pots were damaged?
快递公司给花店运送了20个花盆．约定：每个完好的花盆付运费8元，每个损坏的花盆不收运费还要赔偿12元．结果快递公司收入了100元，损坏了几个花盆？
<gadget id="calculator">20 * 8</gadget>
<output>160</output>

<gadget id="calculator">160 - 100</gadget>
<output>60</output>

<gadget id="calculator">8 + 12</gadget>
<output>20</output>

<gadget id="calculator">60 / 20</gadget>
<output>3</output>

<result>3</result>