The least common multiple of the two numbers of A and B is 78, and the greatest common divisor is 13. It is known that the number of A is 26, and what is the number of B.
甲乙两数的最小公倍数是78，最大公约数是13，已知甲数是26，乙数是多少．
<gadget id="calculator">13 * 3</gadget>
<output>39</output>

<result>39</result>