The actual cement used is 880 tons, saving (1/9) compared to the original plan. How many tons of cement was originally planned?
实际用水泥880吨，比原计划节约(1/9)，原计划用水泥多少吨？
<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">880 / (8/9)</gadget>
<output>990</output>

<result>990</result>