Number A is (6/7) of Number B. The sum of Number A and Number B is 39. What is their least common multiple?
甲数是乙数的(6/7)，甲数与乙数的和是39，它们的最小公倍数是多少．
<gadget id="calculator">6 + 7</gadget>
<output>13</output>

<gadget id="calculator">7 / 13</gadget>
<output>7/13 = around 0.538462</output>

<gadget id="calculator">2 * 3 * 39 * (7/13)</gadget>
<output>126</output>

<result>126</result>