Quant, Math & Computer Science Puzzles for Interview Preparation and Brain Teasing A collection of ~225 Puzzles with Solutions (classified by difficulty and topic)
Source: Alok Goyal (Stellaris VP, Ex-Helion VC) puzzle blog Problem: A fast food restaurant sells dimsums in boxes of 7 and 3. What’s the greatest number of dimsums a person cannot buy. Generalize it for p and q where p and q are relatively prime. I loved the puzzle. Hope you enjoy it too.