There are about 660 cities in my country, and about (2/3) of them have insufficient water supply. How many cities are there in the country with insufficient water supply?
我国约有660个城市，其中约有(2/3)的城市供水不足，全国供水不足的城市大约有多少个？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">660 * (2/3)</gadget>
<output>440</output>

<result>440</result>