spider crawls 27 meters per minute, which is 3 meters more than four times that of a tortoise. How many meters does a tortoise crawl per minute?
蜘蛛每分钟爬行27米，比乌龟的4倍还多3米，乌龟每分钟爬行多少米？
<gadget id="calculator">27 - 3</gadget>
<output>24</output>

<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<result>6</result>