The greatest common factor of two numbers A and B is 42, and the least common multiple is 630. If the number A is 210, what is the number B?
甲、乙两数的最大公因数是42，最小公倍数是630，如果甲数是210，乙数是多少．
<gadget id="calculator">210 / 42</gadget>
<output>5</output>

<gadget id="calculator">630 / 5</gadget>
<output>126</output>

<result>126</result>