The donations from 6 classes in the third grade can just help 3 out-of-school children, and 400 yuan can help a out-of-school child complete primary school. How much is the average donation per class?
三年级6个班的捐款正好能帮助3名失学儿童，400元可以帮助一名失学儿童完成小学学业．平均每班捐了多少元？
<gadget id="calculator">3 / 6</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">400 * (1/2)</gadget>
<output>200</output>

<result>200</result>