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n(B) = 4x
n(A) = n(B)
20+2x = 4x
2x = 20
x = 10
n(A) = 20+2x
= 20+2.10
= 40
n(B) = 4x
= 4.10
= 40
n(AnB) = x
= 10
n(AUB) = n(A)+n(B)+n(AnB)
= 40+40+10
= 90