A group of wild geese flew away (3/4), and there were 15 left. How many wild geese are there in this group?
有一群大雁，飞走了(3/4)，还剩15只，这群大雁有多少只
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">15 / (1/4)</gadget>
<output>60</output>

<result>60</result>