A piece of wood is 3m long and has a cross-section of a square with side length 5cm. The furniture factory ordered 500 pieces of this kind of wood. How many square meters of this batch of wood are there in total?
一根木材长3m，横截面是边长5cm的正方形．家具厂订购了500根这样的木材，这批木材一共多少方？
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) * (1/20) * 3 * 500</gadget>
<output>15/4 = around 3.75</output>

<result>15/4 = around 3.75</result>