A bottle of coffee weighs 450 grams. Xiao Ming needs 16 grams of coffee powder and 9 grams of cube sugar to make a cup of coffee. How many kilograms of cube sugar are needed to make this bottle of coffee?
一瓶咖啡重450克，小明每冲一杯需要16克咖啡粉和9克方糖，冲完这瓶咖啡需要多少千克方糖？
<gadget id="calculator">16 + 9</gadget>
<output>25</output>

<gadget id="calculator">9 / 25</gadget>
<output>9/25 = around 0.36</output>

<gadget id="calculator">(9/25) / 1_000</gadget>
<output>9/25_000 = around 0.00036</output>

<gadget id="calculator">450 * (9/25_000)</gadget>
<output>81/500 = around 0.162</output>

<result>81/500 = around 0.162</result>