Question

Of 480 consumers polled, some purchase music on CDs, some only download music, and some do both. If 280 people polled purchase CDs and 220 purchase CDs and download music, how many people download music?

Answer 1

Number of Consumers = Number who buy CDs + Number who download - number who do both A union B = A + B - (A intersect B) if im wrong sorry hope this helped