The school bought 150 sets of tables and chairs. The unit price of the tables is 45 yuan, and the unit price of the chairs is 18 yuan. How much did the school spend on the tables and chairs?
学校买来150套桌椅，桌子的单价是45元，椅子的单价是18元，学校买桌椅花了多少元？
<gadget id="calculator">45 + 18</gadget>
<output>63</output>

<gadget id="calculator">63 * 150</gadget>
<output>9_450</output>

<result>9_450</result>