There is a pile of coal in the cafeteria. After using up (2/3) of the total amount, another 2600 kilograms are bought, which is equivalent to the original (6/5) now. How many kilograms of coal are there now?
食堂有一堆煤，用去总数的(2/3)后，又买来2600千克，现在相当于原来的(6/5)，现在存煤多少千克？
<gadget id="calculator">6 / 5</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(6/5) - (1/3)</gadget>
<output>13/15 = around 0.866667</output>

<gadget id="calculator">2_600 / (13/15)</gadget>
<output>3_000</output>

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

<result>3_600</result>