Xiaohua made some flowers with 8-meter-long ribbons, and each flower used 0.5-meter ribbons. She gave 4 of them to her classmates, how many flowers are left?
小华用长8米的彩带做了一些花，每朵花用0.5米的彩带．她把其中的4朵送给同学，还剩几朵花？
<gadget id="calculator">8 / 0.5</gadget>
<output>16</output>

<gadget id="calculator">16 - 4</gadget>
<output>12</output>

<result>12</result>