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Out of 100 people surveyed, 60 were women. If 10 were smoking women and 20 were smoking men, what percentage of men surveyed were non-smokers?
A. 10 B. 20 C. 30 D. 40 E. 50
There were \(100 - 60 = 40\) men surveyed. We further read that 20 men were smokers. Thus \(40-20=20\) men were non-smokers. We have enough information to answer the question. \(\frac{40 - 20}{40} = 50%\) of men surveyed were non-smokers. Note that the question stem gives us some redundant information about how many women were smokers.
it's always wise to carefully read what the question is asking for, if it had been my first time answering this question then i too would have have answered 20%
I would avoid questions that assume that men and women are the only genders, in this day and age, since some people identify themselves as non-gendered or other gendered. It would be clearer/more accurate if the item was stated as "Out of 100 men and women surveyed..." or "Out of 100 people surveyed, 60 were women and 40 were men."
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67% (00:33) correct 
