my country is one of the 13 countries with the poorest per capita water resources in the world. A production enterprise actively responded to the government's call to carry out water conservation activities. The water consumption in January is 420 tons, the water consumption in February is January (6/7), and the water consumption in March is February (3/4). How many tons of water is used in March?
我国是全球13个人均水资源最贫乏的国家之一．某生产企业积极响应政府号召，开展节约用水活动．一月份用水420吨，二月份用水量是一月份的(6/7)，三月份用水量是二月份的(3/4)，三月份用水多少吨？
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">420 * (6/7) * (3/4)</gadget>
<output>270</output>

<result>270</result>