Given the natural numbers M and N, their greatest common divisor is 6, and their least common multiple is 210. If M is 30, what is N?
已知自然数M、N，它们的最大公因数是6，最小公倍数是210，如果M是30，那么N是多少．
<gadget id="calculator">6 * 7</gadget>
<output>42</output>

<result>42</result>