The length of an adult's foot is about 1/7 of his height. If the height of an adult is a meter, then how many meters is his foot length?
成人的脚长大约是身高的(1/7)，如果成人的身高为a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>