Question

The National Association for Women in Science asked recent high school grads if they had taken certain science classes. Of those surveyed, 51 said they had taken physics, 142 said they had taken chemistry and 32 said they had taken both. Twenty-five said they had taken neither. How many recent high school grads were surveyed?

Answer 1

a venn diagram might be useful

Answer 2

i see a set for physics, one for chemistry; and one for "the rest"