The greatest common divisor of the two numbers A and B is 6, the least common multiple is 90, the number of A is 18, what is the number of B
甲、乙两个数的最大公约数是6，最小公倍数是90，甲数是18，乙数是多少
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<result>15</result>