The lark choir originally had 45 students, 60% of whom were girls. Later, a few boys were added. Now the ratio of boys to girls is 7:9. How many students are there in the choir now?
百灵鸟合唱团原来有45名学生，其中女生占60%，后来新增加了几个男生，现在男生和女生的比是7：9．现在合唱团有多少名学生？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">7 + 9</gadget>
<output>16</output>

<gadget id="calculator">9 / 16</gadget>
<output>9/16 = around 0.5625</output>

<gadget id="calculator">(3/5) / (9/16)</gadget>
<output>16/15 = around 1.066667</output>

<gadget id="calculator">45 * (16/15)</gadget>
<output>48</output>

<result>48</result>