Each flower is 12 yuan, and the flower shop is holding an event: buy 3 flowers and get one free. Aunt Zhang buys 3 flowers at a time, how much is each flower cheaper?
每枝鲜花12元，鲜花店搞活动：买3枝送一枝，张阿姨一次买3枝，每枝便宜多少元？
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

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

<gadget id="calculator">12 * (3/4)</gadget>
<output>9</output>

<gadget id="calculator">12 - 9</gadget>
<output>3</output>

<result>3</result>