According to statistics: Among the 660 cities in my country, there are (2/3) cities with insufficient water supply. Among these cities with insufficient water supply, another (1/4) city is seriously short of water. How many cities are there in my country that are seriously short of water?
据统计：我国660个城市中，有(2/3)的城市供水不足．在这些供水不足的城市中，又有(1/4)的城市严重缺水．我国严重缺水的城市有多少个？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

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

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">440 * (1/4)</gadget>
<output>110</output>

<result>110</result>