A survey was carried out among 100 ladies leaving a departmental store and, it was observed that 77 had black shoes, 83 had a white bag, 62 carried an umbrella and 95 wore a ring.

What is the minimum number of ladies who must have had all the four items?

23 did not have black shoes
17 did not have a white bag
38 had no umbrella
5 had no ring
If you want to minimize the number with all four, make as many ladies as possible missing one item:
100 - 23 - 17 - 38 - 5 = 17

Posted by Jer on 2012-10-17 12:33:53