India, May 4 -- In the ever-changing world of social media, where trends shift by the hour, one thing remains constant - a good brain teaser. In particular, maths brain teasers hold a special place in the hearts of online communities. If you're a fan of these mind-bending puzzles, we've got a new treat that will leave you puzzled.

(Also read: IQ test: You're a genius-level problem-solver if you can crack this tricky number puzzle)

One particularly intriguing puzzle, shared by the account Brainy Quiz on X (formerly known as Twitter), has captured the internet's attention. The teaser is simple yet baffling, challenging users to solve it in under 15 seconds:

"Brain Test, 12+21=3, 24+42=16, 36+63=27, 47+74=?"

The logic behind these equati...