A person's arm length accounts for about 2/5 of his height, and the length below his knee is about 5/8 of his arm length. The length of a basketball player below his knee is 50cm. How tall is this basketball player?
一个人的臂长约占身高的(2/5)，膝下长度约是臂长的(5/8)，一位篮球运动员的膝下长度是50cm，这个篮球运动员身高多少米？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">50 / (5/8) / (2/5) / 100</gadget>
<output>2</output>

<result>2</result>