Water is composed of hydrogen and oxygen in a mass ratio of 1:8, in which the mass of hydrogen accounts for ((())/(())) and the mass of oxygen accounts for ((())/(())) ． Given that the mass of oxygen is 16 tons, what is the mass of water in tons?
水是由氢和氧按1：8的质量比化合而成的，其中氢的质量占((())/(()))，氧的质量占((())/(()))．已知氧的质量为16吨，那么水的质量为多少吨．
<gadget id="calculator">1 + 8</gadget>
<output>9</output>

<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">16 / (8/9)</gadget>
<output>18</output>

<result>18</result>