There is A ton of cement on the construction site. After (5/18) is used up, the remaining ton is represented by the formula.
工地上有A吨水泥，用去(5/18)后，剩下的吨数用式子表示是多少吨．
<gadget id="calculator">5 / 18</gadget>
<output>5/18 = around 0.277778</output>

<gadget id="calculator">1 - (5/18)</gadget>
<output>13/18 = around 0.722222</output>

<result>13/18 = around 0.722222</result>