A bag of coffee powder weighs 420 grams per bag. It takes 15 grams of coffee powder and 6 grams of sugar to make a cup. How many grams of sugar is needed to finish this bag of coffee powder?
一种袋装咖啡粉，每袋重420克，每冲一杯需要15克咖啡粉和6克糖，冲完这一袋咖啡粉，大约需要多少克糖？
<gadget id="calculator">420 / 15</gadget>
<output>28</output>

<gadget id="calculator">28 * 6</gadget>
<output>168</output>

<result>168</result>