80 grams of brine with a concentration of 5%, 20 grams of brine with a concentration of 8%, pour out 10 grams after mixing the two brines, and add 10 grams of water. What is the concentration of the brine now?
浓度为5%的盐水80克，浓度为8%的盐水20克，两种盐水混合后倒掉10克，再加10克水，现在的盐水浓度是多少？
<gadget id="calculator">20 - 10</gadget>
<output>10</output>

<gadget id="calculator">80 + 10</gadget>
<output>90</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">80 * (1/20)</gadget>
<output>4</output>

<gadget id="calculator">8 / 100</gadget>
<output>2/25 = around 0.08</output>

<gadget id="calculator">20 * (2/25)</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">4 + (8/5)</gadget>
<output>28/5 = around 5.6</output>

<gadget id="calculator">80 + 20</gadget>
<output>100</output>

<gadget id="calculator">(28/5) / 100</gadget>
<output>7/125 = around 0.056</output>

<gadget id="calculator">(7/125) / 100</gadget>
<output>7/12_500 = around 0.00056</output>

<gadget id="calculator">90 * (7/12_500)</gadget>
<output>63/1_250 = around 0.0504</output>

<result>63/1_250 = around 0.0504</result>