A survey of 500 farmers in a midwestern state showed the following.

125 grew only wheat.

110 grew only corn.

90 grew only oats.

200 grew wheat.

60 grew wheat and corn.

50 grew wheat and oats.

180 grew corn.

Determine the number of farmers who

a) Grew at least one of the three.

b) Grew all three.

c) Did not grow any of the three.

d) Grew exactly two of the three.

Draw a Venn diagram to obtain the answers.