(1/3) of the natural number A is equal to (3/4) of the natural number B. What is the minimum value of the sum of A and B?
自然数A的(1/3)与自然数B的(3/4)相等，A与B的和，最小值是多少．
<gadget id="calculator">9 + 4</gadget>
<output>13</output>

<result>13</result>