There is a batch of apples in the orchard, all (1/3) of them are removed in the morning, and 120 kg are removed in the afternoon. At this time, the ratio of the weight of the removed apples to the total weight of apples is 2:5. How many kg are there in total in this batch of apples?
果园有一批苹果，上午运走全部的(1/3)，下午运走120千克，这时已经运走的和苹果总重量的比是2：5，这批苹果共有多少千克？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(2/5) - (1/3)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">120 / (1/15)</gadget>
<output>1_800</output>

<result>1_800</result>