The school buys a batch of science and technology books, distributes (1/4) among them to the sixth grade, and distributes the rest to the fourth and fifth grades according to the ratio of 3:5, and the fifth grade gets 75 books. How many technical books are there in total?
学校购进一批科技书，把其中的(1/4)分给六年级，剩下的按3：5的比例分给四、五年级，五年级分得75本．这批科技书一共有多少本？
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">75 / (5/8) / (3/4)</gadget>
<output>160</output>

<result>160</result>