A batch of exercise books is evenly distributed to students in two classes, and each student can get 6 books. If it is only distributed to class A, each student can get 15 books. Now it is only distributed to Class B, how many copies can each person get.
一批练习本平均分给两个班的学生，每人可分得6本，如果只分给甲班，每人可分得15本．现只分给乙班，每人可得多少本．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/6) - (1/15)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / (1/10)</gadget>
<output>10</output>

<result>10</result>