Hard
Black Riddle
Out of 100 ladies attending the gala,85 had a white handbag;75 had black shoes;60 carried an umbrella;90 wore a ring; How many ladies must have had all four items?
Choose an answer
A.15
B.5
C.20
D.10 Divide by 3. All the ladies had three items. The remainder shows the number of ladies who had 4. 85756090______310 / 3 = 100 + 10 remainder
Answer: 10 Divide by 3. All the ladies had three items. The remainder shows the number of ladies who had 4. 85756090______310 / 3 = 100 + 10 remainder
Using inclusion-exclusion logic on the shortfalls from 100 for each item, at minimum 10 ladies must have possessed all four items.