The number A is 24, the least common multiple of A and B is 168, and the greatest common divisor is 4, what is the number B?
甲数是24，甲、乙两数的最小公倍数是168，最大公约数是4，则乙数为多少．
<gadget id="calculator">2 * 2 * 7</gadget>
<output>28</output>

<result>28</result>