The difference between the area of a triangle and the parallelogram with the same base and height is 5dm**2, what is the total area of the triangle and the parallelogram in dm**2?
一个三角形同与它等底等高的平行四边形的面积相差5dm**2，三角形与平行四边形的面积共多少dm**2．
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">5 + 10</gadget>
<output>15</output>

<result>15</result>