There is a pile of candies, of which halva accounts for 45%, and the rest is soft candy. After adding 160 pieces of soft candy, the halva only accounts for 25%. How many pieces of halva are in this pile of candies?
有一堆糖果，其中酥糖占45%，其余的是软糖，再放入160块软糖后，酥糖就只占25%，那么这堆糖中有酥糖多少块？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 / (9/20)</gadget>
<output>20/9 = around 2.222222</output>

<gadget id="calculator">4 - (20/9)</gadget>
<output>16/9 = around 1.777778</output>

<gadget id="calculator">160 / (16/9)</gadget>
<output>90</output>

<result>90</result>