Xiaoqiao newly bought 3 skirts and 10 shirts, and spent a total of 1740 yuan. The average unit price of 3 skirts is 180 yuan, how much is the average unit price of shirts?
小巧新购置了3条裙子和10件衬衫，共花去1740元．3条裙子的平均单价180元，衬衫的平均单价是多少元钱？
<gadget id="calculator">180 * 3</gadget>
<output>540</output>

<gadget id="calculator">1_740 - 540</gadget>
<output>1_200</output>

<gadget id="calculator">1_200 / 10</gadget>
<output>120</output>

<result>120</result>