SOLUTION: The National Association for Women in Science asked recent high school grads if they had taken certain science classes. Of those surveyed, 28 said they had taken physics, 47 said t

Question 259061: The National Association for Women in Science asked recent high school grads if they had taken certain science classes. Of those surveyed, 28 said they had taken physics, 47 said they had taken chemistry and 13 said they had taken both. Twelve said they had taken neither. How many recent high school grads were surveyed?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
Very poorly worded question.
We do not know what is meant by the 13 who said both. We don't know if they were included in those who said they took physics and chemistry.
We don't know what how many were surveyed who answered none or answered biology or another science.
We therefore need to assume that the 13 were included in the others and there were no other responses and all the students surveyed are included in these
numbers.
So as not count the 13 twice we add the two and subtract 13
47+28=75-13=62 surveyed

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