A car dealership interviewed every driver who came onto their lot on Tuesday. This produced the following results: there were 68 people who owned trucks and 121 people who owned cars. If 35 people owned both a truck and a car and 15 people owned neither, how many people were interviewed?

Question

shane_b · Answer

Add up those who owned trucks and cars:
$$121+68=189$$Subtract off the number of people who owned both:$$189-35=154$$Finally, add in the number of people who owned neither:$$154+15=169$$