The length of an adult's foot is about the height (1/7). If an adult's height is x meters, then how many meters is his foot length?
成人脚的长度大约是身高的(1/7)，如果一个成人的身高为x米，那么他的脚长大约是多少米．
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<result>1/7 = around 0.142857</result>