The factory plans to use (8/9) tons of steel, but actually saves (1/6) compared to the plan. How many tons of steel are actually used?
工厂计划用钢材(8/9)吨，实际比计划节约(1/6)，实际用钢材多少吨？
<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(8/9) * (5/6)</gadget>
<output>20/27 = around 0.740741</output>

<result>20/27 = around 0.740741</result>