Students use 30-meter-long ribbons to make flowers, and each flower uses ribbons (2/5) meters. After taking away a part, there are still (2/3) left. How many flowers are taken away?
同学们用长30米的彩带做花，每朵花用彩带(2/5)米，拿走一部分后，还剩下(2/3)，拿走的花有多少朵？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">30 * (2/3)</gadget>
<output>20</output>

<gadget id="calculator">30 - 20</gadget>
<output>10</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">10 / (2/5)</gadget>
<output>25</output>

<result>25</result>