The base of a triangle is doubled, the height is tripled, and the area is 60 square decimeters larger than the original one. What is the original area of the triangle?
一个三角形的底扩大2倍，高扩大3倍，面积比原来大了60平方分米，原来这个三角形面积是多少？
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">60 / 5</gadget>
<output>12</output>

<result>12</result>