The greatest common divisor of A and B is 6, and the least common multiple is 90. If the number A is 18, what is the number B?
甲数和乙数的最大公约数是6，最小公倍数是90．如果甲数是18，那么乙数是多少？
<gadget id="calculator">90 / 18</gadget>
<output>5</output>

<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<result>30</result>