The National Association for Women in Science asked recent high school grads if they had taken certain science classes. Of those surveyed, 68 said they had taken physics, 108 said they had taken chemistry and 12 said they had taken both. Nine said they had taken neither. How many recent high school grads were surveyed? Show your work

Question

anonymous · Answer

68+108+12+9
197

anonymous · Answer

68 took physics, 12 took both.
so 68-12 took only physics
108 took chemistry
108-12=96 took chemistry only
so now adding all the parts, physics only, chemistry only, physics and chemistry, and lastly neither gives
56+96+12+9=answer 173