450 yuan can help one out-of-school child, and the donation of 9 classes in Love Primary School can just help three out-of-school children. How much is the average donation per class?
450元可以救助一名失学儿童，爱心小学9个班的捐款恰好能救助3名失学儿童，平均每班捐款多少元？
<gadget id="calculator">3 / 9</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">450 * (1/3)</gadget>
<output>150</output>

<result>150</result>