Two factors are multiplied together, the product is 45, one factor is doubled, and the other factor remains unchanged, what is the product.
两个因数相乘，积是45，一个因数扩大2倍，另一个因数不变，积是多少．
<gadget id="calculator">45 * 2</gadget>
<output>90</output>

<result>90</result>