In a certain code language 782 means "Flowers are beautiful", 692 means "Roses are red", 628 means "Roses are beautiful". What does number 9 denotes?

Red

In sentence 1 - flowers are beautiful is coded as 782

In sentence 2 - roses are red is coded as 692

In sentence 3 - roses are beautiful is coded as 628

In sentence 2 and 3 - common words are "roses are" and common numbers are "6 and 2"

In sentence 2, we are left with "red" and "9". Thus, we can say that 9 is coded as "red"