A cube with an edge length of 5dm and a cuboid with a length of 6dm, a width of 3dm and a height of 15dm are melted and cast into a large cuboid. The height of the cuboid is 79dm. What is the area of the base in square decimeters?
把一个棱长为5dm的正方体和一个长6dm，宽3dm，高15dm长方体熔铸成一个大长方体，长方体的高为79dm，底面积是多少平方分米？
<gadget id="calculator">5 * 5 * 5</gadget>
<output>125</output>

<gadget id="calculator">6 * 3 * 15</gadget>
<output>270</output>

<gadget id="calculator">125 + 270</gadget>
<output>395</output>

<gadget id="calculator">395 / 79</gadget>
<output>5</output>

<result>5</result>