The incubation period of goose is 30 days, the incubation period of duck is that of goose (14/15), and that of chicken (2/3). How many days is the incubation period of chicken?
鹅的孵化期是30天，鸭的孵化期是鹅的(14/15)，是鸡的(2/3)，鸡的孵化期是多少天？
<gadget id="calculator">14 / 15</gadget>
<output>14/15 = around 0.933333</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(14/15) / (2/3)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">30 * (7/5)</gadget>
<output>42</output>

<result>42</result>