The school wants to add two new books to the library, which are children's encyclopedias and mathematics books. Each set of children's books is 125 yuan, and each set of mathematics books is 18 yuan. There are 3 sets of each. How much will it cost in total?
学校要为图书室增添两种新书，分别是儿童百科和数学读物，儿童读物每套125元，数学读物每套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>