The colored chalks bought by the school are white chalks (4/5). After using up 30 boxes of white chalks and 25% colored chalks, the remaining colored chalks and white chalks are equal. How many boxes of colored chalks were bought?
学校买来的彩色粉笔是白粉笔的(4/5)，用去30盒白粉笔和25%的彩色粉笔后，剩下的彩色粉笔、白粉笔相等，买来多少盒彩色粉笔？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(4/5) * (1/4)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) + (1/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">30 / (2/5)</gadget>
<output>75</output>

<gadget id="calculator">(4/5) * 75</gadget>
<output>60</output>

<result>60</result>