The sixth grade students collect specimens. The collected butterflies belong to dragonflies (4/5), and the dragonflies belong to praying mantises (1/3). There are 8 butterflies, how many praying mantises?
六年级同学收集标本，收集到的蝴蝶是蜻蜓的(4/5)，蜻蜓是螳螂的(1/3)．蝴蝶有8只，螳螂有多少只？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">8 / (4/5) / (1/3)</gadget>
<output>30</output>

<result>30</result>