12*30=360, if one factor is multiplied by 2, and the other factor remains unchanged, the product becomes what it is.
12*30=360，如果把一个因数乘以2，另一个因数不变，积就变成多少．
<gadget id="calculator">12 * 30 * 2</gadget>
<output>720</output>

<result>720</result>