The school will add two new books to the library. A set of history books is 125 yuan, a set of science and technology books is 18 yuan, and there are 3 sets of each. How much will it cost in total?
学校要为图书室增加两种新书．一种历史书每套125元，一种科技书每套18元，每种3套．一共要花多少钱？
<gadget id="calculator">125 + 18</gadget>
<output>143</output>

<gadget id="calculator">143 * 3</gadget>
<output>429</output>

<result>429</result>