There are 900 grams of sugar water with a concentration of 6%. To increase the concentration to 10%, how many grams of sugar should be added?
有浓度为6%的糖水900克，要使其浓度加大到10%，那么需要加入糖多少克？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">900 * (1/10)</gadget>
<output>90</output>

<gadget id="calculator">6 / 100</gadget>
<output>3/50 = around 0.06</output>

<gadget id="calculator">900 * (3/50)</gadget>
<output>54</output>

<gadget id="calculator">900 - 900 - 54</gadget>
<output>-54</output>

<gadget id="calculator">90 + (-54)</gadget>
<output>36</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">36 / (9/10)</gadget>
<output>40</output>

<result>40</result>