It looks like a simple math sum but has left people scratching their heads... can you solve it?

It looks simple at first, but this math problem has the internet stumped. Don't be fooled - it demands more brainpower than ...
Scientific Research Publishing

CFD Analysis of Pressure and Velocity Profiles in Stenosed Carotid Arteries at Varying Degrees of Occlusion ()

Computational Fluid Dynamics, Carotid Artery Stenosis, Hemodynamics, Pressure Distribution, Velocity Profile Share and Cite: ...