200 people. 33/40 own cell. Of these people 10/11 also own MP3 player. What fraction own a cell phone and an MP3 player?

Question

You survey 200 people about the electronics they own. The results show that 33/40 people own a cell phone. Of these people, 10/11 also own an MP3 player. what fraction of the people own a cell phone and an MP3 player? How many people own a cell phone, but not an MP3 player? Explain.

Answer 1

3/4 is the answer. This is because for this problem you have to multiply 33/40 by 10/11 which equals 330/440 which reduces to 3/4.