Operations with sets

The set B - A has twice as fewer elements as the set A - B and four times fewer elements than the set A ∩ B. How many times more elements does the set A have than the set B?

Correct answer:

k =  1.2

Step-by-step explanation:

BA=n AB=2n AB=4n  k=A/B k=BAABABAB  k=n+4n2n+4n  k=1+42+4=56=151=1.2

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