There are 45 people in the art group, which happens to belong to the music group (5/9). How many people are there in the music group?
美术小组有45人，正好是音乐小组的(5/9)，音乐小组有多少人？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">45 / (5/9)</gadget>
<output>81</output>

<result>81</result>