Of 410 consumers polled, some purchases music on CDs, some only download music, and some do both. If 290 people polled purchase CDs, and 220 purchase CDs and download music, how many people download music?
a. 340
b. 120
c. 70
d. 220***
the answer is 340
so A.
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To find out how many people download music, we need to subtract the number of people who purchase CDs and download music from the total number of people who purchase CDs.
From the information given, we know that 290 people purchase CDs, and 220 people purchase CDs and download music.
Therefore, the number of people who only purchase CDs can be found by subtracting the number of people who purchase CDs and download music (220) from the total number of people who purchase CDs (290):
290 - 220 = 70
So, 70 people only purchase CDs, which means the remaining number of people must be those who download music.
Therefore, the number of people who download music is 70.
Hence, the correct answer is c. 70.