The base of a triangle is 15 decimeters and the height is 4 decimeters. What is the area of the triangle?
一个三角形的底是15分米，高是4分米，这个三角形的面积是多少
<gadget id="calculator">4 / 2 / 100</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">15 * (1/50)</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>