sets

Banashree Patra85 are married, 80 have cars, 75 have phones, and 70 have houses. How many minimumpersons are married, have phone, car and houses on a scale of 100.
......................show me the steps for solving this.😕

If the total number of people is 100,
then the minimum number of those who are both married and have houses is 85 + 70 - 100 = 55 ...(1)
and the minimum number of those who have both car and phone is 80 + 75 - 100 = 55...(2)
From this, the number of those who are married and have house and car and phone is 55 + 55 - 100 = 10

I am sorry that this is not a formal way of doing it. However, I had not done any course on set theory. I am sure there are many CEans, who can give you a structured answer.