For transporting 1,000 glass bottles, it is stipulated that they will be delivered safely, and the shipping fee will be 30 cents for 1 glass bottle. But if you break one, not only will you not pay the shipping fee, but you will also pay 5 cents. If the total shipping fee is 160 yuan after shipping, how many pieces were broken in total?
搬运1000只玻璃瓶，规定安全运到，运1只可得运费3角．但打碎1只，不仅不给运费，还要赔5角．如果运完后共得运费160元，那么共打碎多少只．
<gadget id="calculator">1_000 * 0.3</gadget>
<output>300</output>

<gadget id="calculator">300 - 160</gadget>
<output>140</output>

<gadget id="calculator">0.3 + 0.5</gadget>
<output>0.8</output>

<gadget id="calculator">140 / 0.8</gadget>
<output>175</output>

<result>175</result>