The school distributes the newly purchased 70 books to each grade according to the number of students in the fourth, fifth and sixth grades. There are 48 students in the fourth grade, 40 students in the fifth grade, and 52 students in the sixth grade. The fifth grade has fewer students than the sixth grade. How many copies?
学校把新买来的70本图书按照四、五、六三个年级的人数分给各个年级，四年级有48人，五年级有40人，六年级有52人，五年级比六年级少分多少本？
<gadget id="calculator">48 + 40 + 52</gadget>
<output>140</output>

<gadget id="calculator">70 / 140</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">52 - 40</gadget>
<output>12</output>

<gadget id="calculator">(1/2) * 12</gadget>
<output>6</output>

<result>6</result>