The school library purchased a batch of science books and story books. The number of science books was 1.5 times that of the story books. A total of 1,500 science books and story books were purchased. How many volumes of technical books should be purchased?
学校图书馆购进一批科技书和故事书，科技书的册数是故事书的1.5倍，购进的科技书和故事书一共1500册．购进科技书多少册？
<gadget id="calculator">1.5 + 1</gadget>
<output>2.5</output>

<gadget id="calculator">1_500 / 2.5</gadget>
<output>600</output>

<gadget id="calculator">1_500 - 600</gadget>
<output>900</output>

<result>900</result>