50% of the villagers have their own house.

20% of the villagers cultivate paddy.

33.33% of the villagers are literate.

80% of the villagers are under 25 years of age.

Now, as 80% of the villagers are under 25 years of age, and 33.33% of the villagers are literate, so at least some of the villagers under 25 years of age must be literate.