Children should not carry more than 15% of their own body weight. If they carry heavy objects for a long time, it will hinder the growth of bones. Miaoxiang’s weight is 40kg. How many kilograms should her schoolbag not exceed?
儿童的负重最好不要超过自身体重的15%，如果长期背负过重物体，会妨碍骨酪生长，妙想的体重是40kg，她的书包最好不要超过多少千克？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">40 * (3/20)</gadget>
<output>6</output>

<result>6</result>