The school bought 6 boxes of brushes for the students in the calligraphy interest group, 10 pieces in each box. If the price of each brush is 3 yuan, how much did the school spend on buying these brushes?
学校给书法兴趣小组的同学买了6盒毛笔，每盒10支，如果每支毛笔的价格是3元，学校买这些毛笔一共用了多少钱？
<gadget id="calculator">6 * 10 * 3</gadget>
<output>180</output>

<result>180</result>