The driver, Master Wang, helped the shopping mall transport 20 LCD TVs. The contract stipulated in advance that one set would be delivered in good condition and he would be charged 70 yuan. If it was damaged on the way, he would pay 40 yuan. If it was not delivered, he would not be paid. Now he has shipped all of them and received 1070 yuan. He damaged it How many?
司机王师傅帮商场运液晶电视20台，合同事先规定完好运送一台得70元，途中损坏的倒赔40元，没有运到不得钱，现在他已全部运到，得了1070元，他损坏了几台？
<gadget id="calculator">70 * 20</gadget>
<output>1_400</output>

<gadget id="calculator">1_400 - 1_070</gadget>
<output>330</output>

<gadget id="calculator">70 + 40</gadget>
<output>110</output>

<gadget id="calculator">330 / 110</gadget>
<output>3</output>

<result>3</result>