Question

Need help with A-D in the pic below! Thanks in advance

Answer 1

125 grew only ----------------------wheat
106 grew only-----------------------corn
91   grew only-----------------------oats
198 grew -----------------------wheat
58  grew -----------------------wheat and corn
49  grew -----------------------wheat and oats
172 grew -----------------------corn

we have 
corn
106 grew only-----------------------corn
172 grew -----------------------corn
58  grew -----------------------wheat and corn
172-106=66 wheat corn and oats
58  grew -----------------------wheat and corn
66-58=8-------------------------corn and oats
remains
106 grew only-----------------------corn
172 grew -----------------------106 corn +58 wheat and corn + 8 corn and oats

oats
91   grew only-----------------------oats
49  grew -----------------------wheat and oats

wheat
125 grew only ----------------------wheat
198 grew -----------------------wheat
58  grew -----------------------wheat and corn
49  grew -----------------------wheat and oats
198-125=73  wheat, corn and oats

answers
a) Number of farmers who grew at least one of the three
125+106+91=322 farmers

b) Number of farmers who grew all three
66+73=139 farmers

c) Number of farmers who did not grow any of the three
322+58+8+49=437 farmers

d) Number of farmers who grew exactly two of the three
58+8+49=115 farmers