What is the concentration of the alcohol solution obtained after mixing 500 grams of 70% alcohol solution and 300 grams of 50% alcohol solution?
浓度为70%的酒精溶液500克与浓度为50%的酒精溶液300克，混合后所得到的酒精溶液的浓度是多少．
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">500 * (7/10)</gadget>
<output>350</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">300 * (1/2)</gadget>
<output>150</output>

<gadget id="calculator">350 + 150</gadget>
<output>500</output>

<gadget id="calculator">500 + 300</gadget>
<output>800</output>

<gadget id="calculator">500 / 800</gadget>
<output>5/8 = around 0.625</output>

<result>5/8 = around 0.625</result>