A storybook is 24 yuan, buy 6 and get 2 free, buy 6 at a time, how much is each book cheaper?
一本故事书24元，买6本送2本，一次买6本，每本便宜多少元？
<gadget id="calculator">6 + 2</gadget>
<output>8</output>

<gadget id="calculator">6 / 8</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">24 * (3/4)</gadget>
<output>18</output>

<gadget id="calculator">24 - 18</gadget>
<output>6</output>

<result>6</result>