If you move 1200 bottles, you can get a shipping fee of 5 yuan for every 30 bottles you move. There is no shipping fee for damaged bottles. Someone gets a total shipping fee of 185 yuan. How many bottles did he damage?
搬运1200只瓶子，每搬运30只可得运费5元，损坏的瓶子不给运费，某人共得运费185元，问他损坏了几只瓶子？
<gadget id="calculator">1_200 / 30</gadget>
<output>40</output>

<gadget id="calculator">40 * 5</gadget>
<output>200</output>

<gadget id="calculator">200 - 185</gadget>
<output>15</output>

<gadget id="calculator">15 / 5</gadget>
<output>3</output>

<gadget id="calculator">3 * 30</gadget>
<output>90</output>

<result>90</result>