def setup():
names=["a","b","c"]
IDs=[123,456,789]
ages=[20,25,30]
weights=[50,67,71]
heights=[164,175,151]
print("number of students with age < 30 :",count_age(ages))
def count_age(age):
i = 0
num = 0
for i in range(0, len(age)):
if(age[i]<30):
num = num+1
return num
setup()
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