My mother bought a piece of triangular glass and spent a total of 113.75 yuan. The base of the triangle is 13 decimeters and the height is 5 decimeters. How much is the price per square decimeter of glass?
妈妈买了一块三角形的玻璃，共花了113.75元钱，量得三角形的底是13分米，高是5分米．每平方分米玻璃的售价是多少元？
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">13 * (5/2)</gadget>
<output>65/2 = around 32.5</output>

<gadget id="calculator">113.75 / (65/2)</gadget>
<output>3.5</output>

<result>3.5</result>