transport team transports 500 boxes of thermos bottles to a supermarket, and each box contains 6 thermos bottles. It is known that the shipping fee for every 10 thermos bottles is 5 yuan. If one is damaged, not only the shipping fee will not be paid, but the cost will also be compensated by 10 yuan. When the settlement is made after shipment, the shipping fee for the outbound team will be 1353 yuan. Ask how many thermos bottles were damaged?
某运输队为超市运送暖瓶500箱，每箱装有6个暖瓶．已知每10个暖瓶的运费为5元，损坏一个的话不但不给运费还要赔成本10元，运后结算时，运出队共得1353元的运费．问共损坏了多少只暖瓶？
<gadget id="calculator">500 * 6</gadget>
<output>3_000</output>

<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3_000 * (1/2)</gadget>
<output>1_500</output>

<gadget id="calculator">1_500 - 1_353</gadget>
<output>147</output>

<gadget id="calculator">10 + (1/2)</gadget>
<output>21/2 = around 10.5</output>

<gadget id="calculator">147 / (21/2)</gadget>
<output>14</output>

<result>14</result>