Tobacco smoke contains more than 7,000 kinds of chemical substances, among which carcinogens account for at least (69/7000), how many kinds of carcinogens are there at least in tobacco smoke?
烟草烟雾中含有7000余种化学物质，其中致癌物质至少占(69/7000)，烟草烟雾中的致癌物质至少有多少种？
<gadget id="calculator">69 / 7_000</gadget>
<output>69/7_000 = around 0.009857</output>

<gadget id="calculator">7_000 * (69/7_000)</gadget>
<output>69</output>

<result>69</result>