- Joined
- Aug 6, 2015
- Messages
- 2
- Reaction score
- 0
Hello all, I have an inquiry on this question: "Half the population of Green Village is vegetarian, and 35% ride bicycles. If 20% are both vegetarian and ride bicycles, what is the probability that a person chosen at random from Green Village is either a vegetarian or rides a bicycle?". The solution is 50%-20%=30%, 35%-20%=15%, 30%+15%+20%=65%. I only vaguely understand why you would subtract 20% from 50% and 35%, but I'm having some trouble understanding why you would add it back in at the end. Thank you in advance for your time and responses!