Two two-digit natural numbers, their greatest common factor is 6, and their least common multiple is 90, what is the sum of these two numbers?
两个两位自然数，它们的最大公因数是6，最小公倍数是90，这两个数的和是多少．
<gadget id="calculator">2 * 3 * 3</gadget>
<output>18</output>

<gadget id="calculator">2 * 3 * 5</gadget>
<output>30</output>

<gadget id="calculator">18 + 30</gadget>
<output>48</output>

<result>48</result>