Mix 40 kg of brine with a concentration of 25% and 60 kg of brine with a concentration of 10%, what is the concentration of the brine after mixing?
把浓度为25%的40千克盐水与浓度为10%的60千克盐水混合在一起，混合后的盐水浓度是多少？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * 40</gadget>
<output>10</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) * 60</gadget>
<output>6</output>

<gadget id="calculator">10 + 6</gadget>
<output>16</output>

<gadget id="calculator">40 + 60</gadget>
<output>100</output>

<gadget id="calculator">16 / 100</gadget>
<output>4/25 = around 0.16</output>

<result>4/25 = around 0.16</result>