Chen Zheng has 84 stamps, of which (5/7) are Chinese stamps, and the rest are foreign stamps. How many foreign stamps does Chen Zheng have?
陈征有84枚邮票，其中(5/7)是中国邮票，其余的是外国邮票，陈征有多少外国邮票？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">1 - (5/7)</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">84 * (2/7)</gadget>
<output>24</output>

<result>24</result>