The incubation period of an ostrich is equivalent to (3/2) that of a quail, with a difference of about 15 days. How many days is the incubation period of a quail?
鸵鸟孵化期相当于鹌鹑孵化期的(3/2)，大约相差15天，鹌鹑孵化期大约是多少天？
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) - 1</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">15 / (1/2)</gadget>
<output>30</output>

<result>30</result>