The children's bookstore shipped in a batch of comic books, sold 35% of the total on the first day, 45% of the total on the second day, and the remaining 150 copies on the third day. How many books are there in this batch of comic strips?
儿童书店运进一批连环画，第一天卖出总数的35%，第二天卖出总数的45%，第三天卖出剩下的150本．这批连环画一共多少本？
<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">1 - (9/20) - (7/20)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">150 / (1/5)</gadget>
<output>750</output>

<result>750</result>