Each hectare of Johnson's neighbor can yield 80 x 2 = <<80*2=160>>160 corns every two months.

So, the neighbor's two-hectare cornfield can yield a total of 160 x 2 = <<160*2=320>>320 corns every two months.

They yield a total of 80 + 320 = <<80+320=400>>400 corns.

Therefore, They can harvest 400 x 3 = <<400*3=1200>>1200 corns altogether.

# Answer

1200
<|im_start|>system
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<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
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user
1200
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?
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