Mix 200 grams of 60% sugar water with 200 grams of 30% sugar water. Find the concentration of sugar water after mixing.
浓度为60%的糖水200克与浓度为30%的糖水200克混合．求混合之后糖水的浓度．
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">200 * (3/5)</gadget>
<output>120</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">200 * (3/10)</gadget>
<output>60</output>

<gadget id="calculator">120 + 60</gadget>
<output>180</output>

<gadget id="calculator">200 + 200</gadget>
<output>400</output>

<gadget id="calculator">180 / 400</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(9/20) * 1</gadget>
<output>9/20 = around 0.45</output>

<result>9/20 = around 0.45</result>