The school used 240 tons of water in April, which was 1/5 less than that in March. How many tons of water was used in March?
学校四月份用水240吨，比三月份少用(1/5)，三月份用水多少吨？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">240 / (4/5)</gadget>
<output>300</output>

<result>300</result>