In a certain code language 782 means "Flowers are beautiful", 692 means "Roses are red", 628 means "Roses are beautiful". Which of the number denotes 'Flowers'?

7

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 1 and 3, "are beautiful" is coded as " 2 and 8"

In sentence 1, we are left with "flowers" and code "7". Thus, we can say that flowers can be coded as "7"