Iift 2015 Question 37
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IIFT
22% of the families own agricultural land, 18% own a mobile phone, 1600 families own both and 68% families own none.
P(A B) = P(A) + P(B) - P(A B)
32 = 22 + 18 - x
x=8. Hence, there will be 8% families who own both.
8% =1600 (Given in question)
Total families in a village =>100% = 20000