It is known that the product of two factors is 0.45, one factor is 0.5, and what is the other factor.
已知两个因数的积是0.45，一个因数是0.5，另一个因数是多少．
<gadget id="calculator">0.45 / 0.5</gadget>
<output>0.9</output>

<result>0.9</result>