If the number A is (2/3) of the number B, how much is the number A in the sum of A and B (fill in the fraction).
如果甲数是乙数的(2/3)，则甲数占甲乙总和的多少(填分数)．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 + (2/3)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">(2/3) / (5/3)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>