A cuboid with a length of 2.5 decimeters is cut along the cross section and its area increases by 10 decimeters, what is its volume in cubic decimeters
一块长方体长为2.5分米，沿横截面截开后，面积增加了10平方分米，则它的体积为多少立方分米
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 * 2.5</gadget>
<output>12.5</output>

<result>12.5</result>