Decompose A into prime factors of 2*3*5 and B into prime factors of 2*2*5, what is their greatest common factor?
把A分解质因数2*3*5，把B分解质因数2*2*5，它们的最大公因数是多少．
<gadget id="calculator">2 * 5</gadget>
<output>10</output>

<result>10</result>