Xiaohong said: "My heart beats 18 times in 15 seconds." Use the basic property of proportion to speculate how many times Xiaohong's heart beats in 1 minute.
小红说："我的心脏15秒跳18次．"用比例的基本性质推测一下，小红的心脏1分钟跳多少次．
<result>72</result>