The sum of Chen Ying and Zhang Qiang's weight is 68kg, Chen Ying is Zhang Qiang's weight (8/9), how many kilograms is Chen Ying's weight lighter than Zhang Qiang's?
陈颖和张强的体重和为68kg，陈颖是张强的体重的(8/9)，陈颖的体重比张强的轻多少千克？
<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">1 + (8/9)</gadget>
<output>17/9 = around 1.888889</output>

<gadget id="calculator">68 / (17/9)</gadget>
<output>36</output>

<gadget id="calculator">68 - 36</gadget>
<output>32</output>

<gadget id="calculator">36 - 32</gadget>
<output>4</output>

<result>4</result>