The sum of the areas of a triangle and its parallelogram with the same base and height is 120m**2, what is the area of the triangle?
一个三角形和与它等底等高的平行四边形面积和是120m**2，三角形面积是多少．
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">120 / 3</gadget>
<output>40</output>

<result>40</result>