The product of two factors is 300. If one of the factors is reduced by 2 and the other factor is increased by 4, what is the product?
两个因数的积是300，其中一个因数缩小2倍，另一个因数扩大4倍后，积是多少
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">300 * 2</gadget>
<output>600</output>

<result>600</result>