The school will add two new books to the library, 3 sets of each. Among them, each set of "Children's Encyclopedia" is 125 yuan, and each set of "Mathematical Guess" is 18 yuan. How much does it cost in total?
学校要为图书馆增添两种新书，每种3套．其中每套《儿童百科》125元，每套《数学猜想》18元，一共要花多少钱？
<gadget id="calculator">125 * 3</gadget>
<output>375</output>

<gadget id="calculator">18 * 3</gadget>
<output>54</output>

<gadget id="calculator">375 + 54</gadget>
<output>429</output>

<result>429</result>