India, May 31 -- Brain teasers are more than just a fun distraction - they're powerful tools for mental fitness. Engaging with puzzles and riddles activates parts of the brain linked to memory, logic, and concentration. Regular mental challenges can sharpen problem-solving abilities, encourage creative thinking, and even help delay cognitive decline. That's why brain teasers have become wildly popular on social media, where users love putting their minds to the test - and sharing the challenge with others.

One such puzzle has been making waves on X (formerly Twitter), shared by Brainy Bits Hub. The image presents a sequence of math equations with a twist:

If 2 + 1 = 3 and 4 + 3 = 21 and 6 + 5 = 55 Then 5 + 4 = ?

At first glance, these ...