General Studies · Seating Arrangement / Puzzles

In a cafeteria, seven customers (B, G, H, K, L, M and N) sit on three different benches (X, Y and Z). Each bench must have at least two customers sitting on it. Customer G does not sit with customers K, L and M. Customer B sits only with customer N. Custom er K sits on Bench X with his best friends. Customer H sits on Bench Z. On which bench are there exactly three customers?