For a pile of coal, the first truck transports (1/3) of the total amount, the second truck transports (2/5) of the total amount, and there are still 2400 kilograms. How many kilograms are there in total in this pile of coal?
一堆煤，第一车运走总量的(1/3)，第二车运走总量的(2/5)，还有2400千克，这堆煤总共有多少千克？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">(1/3) + (2/5)</gadget>
<output>11/15 = around 0.733333</output>

<gadget id="calculator">1 - (11/15)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">2_400 / (4/15)</gadget>
<output>9_000</output>

<result>9_000</result>