There are two piles of coal, 25% of which is shipped from pile A to pile B. At this time, the two piles of coal are just equal. It is known that the original coal of pile A is 320 tons, and how many tons of coal is the original coal of pile B?
有两堆煤，从甲堆运出25%给乙堆，这时两堆煤正好相等，已知甲堆原有煤320吨，乙堆原有煤多少吨？
<gadget id="calculator">25 / 100</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">320 * (3/4)</gadget>
<output>240</output>

<gadget id="calculator">320 * (1/4)</gadget>
<output>80</output>

<gadget id="calculator">240 - 80</gadget>
<output>160</output>

<result>160</result>