Subject: mathqa
Question: in an office , 60 percent of the workers have at least 5 years of service , and a total of 16 workers have at least 10 years of service . if 90 percent of the workers have fewer than 10 years of service , how many of the workers have at least 5 but fewer than 10 years of service ?
Option: 
A: 160
B: 64
C: 96
D: 50
Answer: C