The school shipped 6 story books and 6 science books each. There are 30 story books and 45 technology books. How many books were shipped in total?
学校运来故事书、科技书各6件．故事书每件30本，科技书每件45本．一共运来的书多少本？
<gadget id="calculator">30 * 6</gadget>
<output>180</output>

<gadget id="calculator">45 * 6</gadget>
<output>270</output>

<gadget id="calculator">180 + 270</gadget>
<output>450</output>

<result>450</result>