When changing water in a swimming pool, 500 cubic meters of water is drained for the first time, and 700 cubic meters of water is drained for the second time. At this time, the remaining water in the pool is (2/5). How many cubic meters of water was there in total?
一个游泳池换水，第一次放掉500立方米的水，第二次放掉700立方米的水，这时剩下全池水的(2/5)．池里原来一共有水多少立方米？
<gadget id="calculator">500 + 700</gadget>
<output>1_200</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1_200 / (3/5)</gadget>
<output>2_000</output>

<result>2_000</result>