Classes A and B have the same number of students. The number of boys in class A is (2/5) the number of girls in class B; the number of girls in class A is 1 (4/5) times the number of boys in class B. So what fraction of the number of boys in class A is the number of boys in class B?
甲乙两个班的人数相同，甲班男生的人数是乙班女生人数的(2/5)；甲班女生人数是乙班男生人数的1(4/5)倍．那么甲班男生人数是乙班男生人数的几分之几？
<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

<result>8/15 = around 0.533333</result>