A square wooden block with an edge length of 5 decimeters needs 0.4 kilograms of paint per square meter to paint its surface. If 100 such wooden blocks are to be painted, how many kilograms of paint are needed at least?
一个棱长5分米的正方体木块，对它的表面进行油漆，每平方米需油漆0.4千克，要给100个这样的木块进行油漆，至少需要油漆多少千克？
<gadget id="calculator">6 / 100</gadget>
<output>3/50 = around 0.06</output>

<gadget id="calculator">5 * 5 * (3/50) * 0.4 * 100</gadget>
<output>60</output>

<result>60</result>