A pile of coal is transported away in three batches, the quality of the first batch is the second batch (7/8), the quality of the second batch is the third batch (8/9), the third batch is known 6,000 kilograms more than the first batch, how many kilograms is this pile of coal?
有一堆煤分三批运走，第一批运走的质量是第二批的(7/8)，第二批运走的质量是第三批的(8/9)，已知第三批比第一批多运走6000千克，这堆煤有多少千克？
<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">(8/9) * (7/8)</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">1 - (7/9)</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">6_000 / (2/9)</gadget>
<output>27_000</output>

<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">27_000 * (7/9)</gadget>
<output>21_000</output>

<gadget id="calculator">27_000 * (8/9)</gadget>
<output>24_000</output>

<gadget id="calculator">21_000 + 24_000 + 27_000</gadget>
<output>72_000</output>

<result>72_000</result>