The number of times a person's heart beats changes with age. Babies beat about 135 times per minute, which is more (4/5) than adolescents. How many times per minute is the heartbeat of adolescents? (Solution of column equation)
人心脏跳动的次数随着年龄而发生变化．婴儿每分钟跳大约135次，比青少年每分钟跳动的次数多(4/5)，青少年每分钟心跳大约多少次？(列方程解)
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) + 1</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">135 / (9/5)</gadget>
<output>75</output>

<result>75</result>