The County Experimental School has a grade-level reading room, with 1,350 books in the third grade and 1,100 books in the fourth grade. How many books are there in total for the third and fourth grades?
县实验学校开设年级阅览室，三年级藏书1350本，四年级藏书的数量是三年级的2倍少1100本，三、四年级共藏书多少本？
<gadget id="calculator">1_350 * 2</gadget>
<output>2_700</output>

<gadget id="calculator">2_700 - 1_100</gadget>
<output>1_600</output>

<gadget id="calculator">1_600 + 1_350</gadget>
<output>2_950</output>

<result>2_950</result>