The sum of the numbers A and B is 60, the number A is 50% of the number B, what is the number B?
甲、乙两数的和是60，甲数是乙数的50%，乙数是多少．
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">60 / (3/2)</gadget>
<output>40</output>

<result>40</result>