Lihua Primary School bought 300 boxes of white chalk, which was 120 boxes more than colored chalk. How many boxes of chalk did they buy in total?
立华小学买白粉笔300盒，比彩色粉笔多120盒，一共买粉笔多少盒？
<gadget id="calculator">300 - 120</gadget>
<output>180</output>

<gadget id="calculator">180 + 300</gadget>
<output>480</output>

<result>480</result>