There are several kilograms of sugar water. If you add 2 kg of sugar, the concentration of sugar water will be 20%. If you add 8 kg of water, the concentration of sugar water will be 12%. Do you know the original concentration of sugar water?
有糖水若干千克，如果加2千克糖，则糖水的浓度为20%，如果加8千克水，则糖水的浓度为12%，你知道原来糖水的浓度是多少吗？
<gadget id="calculator">12 / 100</gadget>
<output>3/25 = around 0.12</output>

<gadget id="calculator">(3/25) * 32</gadget>
<output>96/25 = around 3.84</output>

<gadget id="calculator">96 / 100</gadget>
<output>24/25 = around 0.96</output>

<gadget id="calculator">(96/25) + (24/25)</gadget>
<output>24/5 = around 4.8</output>

<gadget id="calculator">(24/5) / 32</gadget>
<output>3/20 = around 0.15</output>

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

<gadget id="calculator">(3/20) * 1</gadget>
<output>3/20 = around 0.15</output>

<result>3/20 = around 0.15</result>