There is a batch of rice in the freight yard, (2/5) of the total number is removed on the first day, 1500 bags are removed on the second day, and there are 900 bags left. How many bags are there in this batch of rice?
货场有一批大米，第1天运走总数的(2/5)，第2天运走1500袋，还剩900袋．这批大米一共有多少袋？
<gadget id="calculator">1_500 + 900</gadget>
<output>2_400</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">2_400 / (3/5)</gadget>
<output>4_000</output>

<result>4_000</result>