In an earthwork project, 5 excavators were used. After working for 1 day, 2 excavators were transferred away. As a result, the completion of the project was delayed by 2 days. How much would it cost to complete the earthwork with 1 excavator? sky.
一项土方工程，用5台掘土机，工作1天后，有2台掘土机被调走，结果完成该工程推迟了2天，如果用一台掘土机来完成这项土方工程要多少天．
<gadget id="calculator">5 * 1</gadget>
<output>5</output>

<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">3 * 1 * 2</gadget>
<output>6</output>

<gadget id="calculator">3 * 1</gadget>
<output>3</output>

<gadget id="calculator">6 - 3</gadget>
<output>3</output>

<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">8 / 2 / 1</gadget>
<output>4</output>

<gadget id="calculator">5 * 1 * 4</gadget>
<output>20</output>

<result>20</result>