The sales of science and technology books in Yucai Bookstore in the first quarter are as follows: 289 books were sold in January, 276 books were sold in February, and 344 books were sold in March. How many technical books are sold per month on average?
育才书店第一季度科技书的销售情况是：一月售出289本，二月售出276本，三月售出344本．平均每月售出科技书多少本？
<gadget id="calculator">289 + 276 + 344</gadget>
<output>909</output>

<gadget id="calculator">909 / 3</gadget>
<output>303</output>

<result>303</result>