Johnson owns a hectare cornfield that can yield 80 corn every two months, while his neighbor owns a two-hectare cornfield and each hectare can yield twice the amount as Johnson. How much corn can they harvest altogether after six months? Let's think first. Chain of thought:
Each hectare of Johnson's neighbor can yield 80 x 2 = 160 corns every two months. So, the neighbor's two - hectare cornfield can yield a total of 160 x 2 = 320 corns every two months. They yield a total of 80 + 320 = 400 corns. Therefore, They can harvest 400 x 3 = 1200 corns altogether.
Therefore, the answer is 1200.