mixed 20% and 30% sugar water together and wanted to make 24% sugar water, but I accidentally reversed the ratio. What is the concentration of the wrongly mixed sugar water?
把20%和30%的糖水混在一起，想配成24%的糖水，可是不小心把比例弄反了，请问配错了的糖水的浓度是多少？
<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">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2 * (1/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(9/10) + (2/5)</gadget>
<output>13/10 = around 1.3</output>

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

<gadget id="calculator">(13/10) / 5</gadget>
<output>13/50 = around 0.26</output>

<result>13/50 = around 0.26</result>