There are two piles of coal, the first pile is removed (1/4), the second pile is partially removed (3/5), and the weight ratio of the remaining coal between the first pile and the second pile is 3:5. The first pile of original coal is 120 tons, how many tons of the second pile of original coal?
有两堆煤，第一堆运走(1/4)，第二堆煤运走一部分后还剩下(3/5)，余下的煤第一堆与第二堆重量比是3：5，第一堆原有煤120吨，第二堆原有煤多少吨？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">120 * (3/4)</gadget>
<output>90</output>

<gadget id="calculator">5 / 3</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(5/3) / (3/5)</gadget>
<output>25/9 = around 2.777778</output>

<gadget id="calculator">90 * (25/9)</gadget>
<output>250</output>

<result>250</result>