Why my code doesn't work?

Question

I don't understand why my code doesn't work.
a = int(input())
b = float(input())
res = a / (b * b)
if res < 18.5:
print ("Underweight")
elif res >= 18.5 and < 25:
print ("Normal")
elif res >= 25 and < 30:
print ("Overweight")
elif res >= 30:
print ("Obesity")

Answer 1

In the 2nd and 3rd elif-condition res is missing:

res >= 18.5 and res < 25

res >= 25 and res < 30

Answer 2

Remove 'and' from elif condition

Answer 3

Thanks!