The transportation company shipped 1000 vases. It is stipulated that the shipping fee for one piece is 3 yuan, but the compensation for breaking one piece is only 20.5 yuan. As a result, the transportation company got a total of 2906 yuan for shipping. Q How many vases were accidentally broken during transportation? (column equations to solve problems)
运输公司运1000只花瓶．规定运输一只可得运费3元，但打碎一只要赔20.5元，结果运输公司共得运费2906元．问运输中不小心打碎了几只花瓶？(列方程解决问题)
<gadget id="calculator">3 * 1_000</gadget>
<output>3_000</output>

<gadget id="calculator">3_000 - 2_906</gadget>
<output>94</output>

<gadget id="calculator">20.5 + 3</gadget>
<output>23.5</output>

<gadget id="calculator">94 / 23.5</gadget>
<output>4</output>

<result>4</result>