It is known that the least common multiple of two numbers A and B is 180, and the greatest common divisor is 30. If A=90, then B=how much.
已知A、B两数的最小公倍数是180，最大公约数是30，若A=90，则B=多少．
<gadget id="calculator">2 * 3 * 5 * 2</gadget>
<output>60</output>

<result>60</result>