What is the concentration of 2 kg of sugar water containing 70% sugar and 3 kg of sugar water containing 60% sugar?
含糖70%的糖水2千克和含糖60%的糖水3千克混合后的浓度是多少．
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">2 * (7/10)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">3 * (3/5)</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">(7/5) + (9/5)</gadget>
<output>16/5 = around 3.2</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">(16/5) / 5</gadget>
<output>16/25 = around 0.64</output>

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

<gadget id="calculator">(16/25) * 1</gadget>
<output>16/25 = around 0.64</output>

<result>16/25 = around 0.64</result>