Tongle School advocates "water conservation". In February, 180 tons of water is used, and in March, the water used is that of February (7/9). How many tons of water is used in March?
同乐学校倡导"节约用水"，二月份用水180吨，三月份用水是二月份用水的(7/9)，三月份用水多少吨．
<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">180 * (7/9)</gadget>
<output>140</output>

<result>140</result>