If the product of two factors is 64.5, one of the factors remains unchanged and the other factor is multiplied by 10, what is the product of the two factors?
如果两个因数的积是64.5，其中一个因数不变，另一个因数乘10，这时两个因数的乘积是多少
<gadget id="calculator">64.5 * 10</gadget>
<output>645</output>

<result>645</result>