Question

（2）.甲班有学生50人,从甲班调五分之一到乙班,这时乙班人数比甲班多五分之一,乙班原有多少人

Answer 1

设乙班原有x人

x + 50*(1/5) = [ 50 - 50*(1/5)] * (1+ 1/5)

x + 10 = (50-10) * 1.2

x = 4*12 -10

x = 38