There are two cups, A and B, filled with the same amount of salt water. The salt in cup A accounts for 1/3 of the salt water, and the salt in cup B accounts for 1/6 of the salt water. After mixing the two cups of salt water , How much salt accounts for the brine.
甲、乙两个杯子，里面盛了同样多的盐水，甲杯里的盐占盐水的(1/3)，乙里的盐占盐水的(1/6)，把两杯盐水混合在一起后，盐占盐水的多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/3) + (1/6)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">(1/2) / 2</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>