Of 80 Barbie dolls, have one eye bigger than the other and have one arm bigger than the other. If no doll has both the defects, then how many dolls are defective?

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Of 80 Barbie dolls, <img src='https://www.fatskills.com/images/Image63248.png' > have one eye bigger than the other and <img src='https://www.fatskills.com/images/Image63255.png' > have one arm bigger than the other. If no doll has both the defects, then how many dolls are defective?