project can be completed in a few days by 45 people. Now after 45 people work for 6 days, 9 people are transferred to other jobs. Thus, it took 4 more days to complete the project than originally planned. How many days did you plan to complete the project?
一项工程，45人可以若干天完成．现在45人工作6天后，调走9人干其他工作．这样，完成这项工程就比原来计划多用了4天．原计划完成这项工程用多少天？
<gadget id="calculator">45 * 6</gadget>
<output>270</output>

<gadget id="calculator">45 - 9</gadget>
<output>36</output>

<gadget id="calculator">36 * 4</gadget>
<output>144</output>

<gadget id="calculator">36 * 6</gadget>
<output>216</output>

<gadget id="calculator">144 - 216</gadget>
<output>-72</output>

<gadget id="calculator">270 + (-72)</gadget>
<output>198</output>

<gadget id="calculator">45 - 36</gadget>
<output>9</output>

<gadget id="calculator">198 / 9</gadget>
<output>22</output>

<result>22</result>