Cut off a cube with a side length of 3 cm from a cuboid, and the remaining part is a cuboid with a volume of 45 cubic centimeters. What is the length of the cuboid in centimeters?
从一个长方体上截下一个棱长为3厘米的正方体，剩下部分是一个长方体，它的体积是45立方厘米，原来这个长方体长多少厘米．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">45 / 9</gadget>
<output>5</output>

<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<result>8</result>