A certain school carried out the activity of "creating a conservation-oriented school". In June, it used 220 tons of water, which was 3/8 less than in May. How many tons of water was used in May?
某校开展了"创建节约型学校"活动，六月份用水220吨，比五月份节约了(3/8)，五月份用水多少吨？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (3/8)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">220 / (5/8)</gadget>
<output>352</output>

<result>352</result>