Given that (a, b)=18, (a, b)=270, a=54, find b.
已知(a，b)=18，(a，b)=270，a=54，求b．
<gadget id="calculator">270 / 54</gadget>
<output>5</output>

<gadget id="calculator">18 * 5</gadget>
<output>90</output>

<result>90</result>