Xinhua Bookstore sold 1,500 science and technology books in October, and sold 200 less children's books than three times the number of science and technology books. How many science and children's books did Xinhua Bookstore sell in October?
新华书店十月份售出科技书1500册，售出的儿童读物是科技书的3倍少200册，新华书店十月份售出科技书和儿童读物共多少册？
<gadget id="calculator">1_500 * 3</gadget>
<output>4_500</output>

<gadget id="calculator">4_500 - 200</gadget>
<output>4_300</output>

<gadget id="calculator">4_300 + 1_500</gadget>
<output>5_800</output>

<result>5_800</result>