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> a mostly vegetarian country like India

One to two fifths of Indians are vegetarian [1]. The majority eat meat.

31% are vegetarian. An additional 9% consume only eggs. 30% of those who consume meat do so very infrequently.

> 30% of those who consume meat do so very infrequently

You misread the quote. Less than 30% consume meat regularly; 30% consume it infrequently.

--> 43% of those who consume any meat, consume it infrequently.

Yup. Three fifths of Indians eat meat, and four fifths to a half of those that do do so regularly.