A triangular wooden board with a base of 5 decimeters and a height of 4 decimeters is painted with paint on both sides, and the total amount of paint removed is 0.72 kg. How many kilograms of paint is used per square meter of wood board?
一块底5分米、高4分米的三角形木板正反两面刷上油漆，一共用去油漆0.72千克，每平方米木板用油漆多少千克？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">5 * 2 * 2</gadget>
<output>20</output>

<gadget id="calculator">0.72 / 20</gadget>
<output>0.036</output>

<gadget id="calculator">0.036 * 100</gadget>
<output>3.6</output>

<result>3.6</result>