A cup of salt water is 100 grams, with a salt content of 5%, and another cup of salt water is 200 grams, with a salt content of 12.5%. If these two cups of water are combined, what is the salt content?
一杯盐水100克，含盐率为5%，另一杯盐水200克，含盐率为12.5%，这两杯水合在一起，含盐率是多少？
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">100 * (1/20)</gadget>
<output>5</output>

<gadget id="calculator">12.5 / 100</gadget>
<output>0.125</output>

<gadget id="calculator">200 * 0.125</gadget>
<output>25</output>

<gadget id="calculator">5 + 25</gadget>
<output>30</output>

<gadget id="calculator">100 + 200</gadget>
<output>300</output>

<gadget id="calculator">30 / 300</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>