A factory used 7200 tons of water in October, saving (1/9) compared to the original plan. How many tons of water was originally planned in October?
某工厂十月份用水7200吨，比原计划节约了(1/9)．十月份原计划用水多少吨？
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">1 - (1/9)</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">7_200 / (8/9)</gadget>
<output>8_100</output>

<result>8_100</result>