6. In a survey of 100 people, 73 owned only stocks. Six of the people invested in both stocks and bonds. How many people owned bonds only?

Question

This is what I did:
73+6=79
100-79=21

Answer 1

You don't indicate whether the remaining persons own bonds or neither bonds or stocks. If the former, I agree.

Answer 2

73+6=79
100-79=21