Question

if less than half of a garden is planted with corn is it reasonable to estimat that 2 thirds of the garden is planted with corn?

Answer 1

No.

1/2 = 3/6
2/3 = 4/6

Answer 2

No because that means that you are saying that LESS than half should be without corn so if it's less it should be either 2/5 or 1/5.