Water is composed of hydrogen and oxygen in a mass ratio of 1:8. What is the mass of oxygen in a bottle of water weighing 432 grams?
水是由氢和氧按1：8的质量比组成的，一瓶重432克的水，氧的质量是多少．
<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">432 * (8/9)</gadget>
<output>384</output>

<result>384</result>