Question 473577
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Hi, 
180 people 
74 people watched movies on VHS tapes (Event A)
123 people watched movies on DVDs (Event B)
27 people watched movies both on VHS tapes and DVDs 
{{{drawing(300,300,-4,4,-5,4,
rectangle(-4,-1.6,4,4), locate(-2,1.8,47),locate(1.5,1.7,96),
locate(-3.7,-1,10),
 locate(-3.5,2.5,A), locate(-.1,1.8,27),
circle(-sqrt(2),sqrt(2),2),locate(3.5,2.5,B),
circle(sqrt(2),sqrt(2),2))}}}
i. Of these surveyed, how many watched only VHS tapes? 47
ii. Of these surveyed, how many watched only DVDs? 96
iii. Of those surveyed, how many watched VHS tapes or DVDs, but not both? 143
iv. Of those surveyed, how many watched VHS tapes or DVDs, or both? 170