The number of bottles of red ink in the school accounts for (4/9) of the total number of bottles of red and black ink. Later, 60 bottles of red ink were bought, and the number of red ink bottles accounted for (6/11) of the total number of red and black ink bottles. What is the total number of bottles of red and black ink in this school?
学校红墨水的瓶数占红、黑墨水总瓶数的(4/9)．后来买进60瓶红墨水，这时红墨水的瓶数占红、黑墨水总瓶数的(6/11)．这个学校现有红、黑墨水的总数是多少瓶？
<gadget id="calculator">11 - 6</gadget>
<output>5</output>

<gadget id="calculator">6 / 5</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">9 - 4</gadget>
<output>5</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(6/5) - (4/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">6 / 11</gadget>
<output>6/11 = around 0.545455</output>

<gadget id="calculator">1 - (6/11)</gadget>
<output>5/11 = around 0.454545</output>

<gadget id="calculator">60 / (2/5) / (5/11)</gadget>
<output>330</output>

<result>330</result>