Xiji County called on all units to donate to schools in mountainous areas. The Civil Affairs Bureau donated 20% more than the Water Affairs Bureau. It is known that the Civil Affairs Bureau donated 3,600 yuan. How much did the Water Affairs Bureau donate?
西吉县号召各单位为山区学校捐款，民政局比水务局的捐款多20%，已知民政局捐了3600元，水务局捐了多少元？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">3_600 / (6/5)</gadget>
<output>3_000</output>

<result>3_000</result>