Mix 1 kg of sugar water with 20% sugar content and 3 kg of sugar water with 30% sugar content together, what is the sugar content of the sugar water at this time?
把1kg含糖为20%的糖水和3kg含糖为30%的糖水混合在一起，这时糖水的含糖量为多少．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 * (1/5)</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">3 * (3/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">(1/5) + (9/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">(11/10) / 4</gadget>
<output>11/40 = around 0.275</output>

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

<gadget id="calculator">(11/40) * 1</gadget>
<output>11/40 = around 0.275</output>

<result>11/40 = around 0.275</result>