tolong bantuannya nomor 10 ya..

n(Q) = n(R)
14 + 5 + 8 + 2x = 17 + 5 + 8 + x + 9
27 + 2x = 39 + x
2x - x = 39 - 27
x = 12

n(Q U R) = n(Q) + n(R) - n(Q ∩ R)
n(Q U R) = (27 + 24) + (39 + 12) - (5 + 8)
n(Q U R) = 51 + 51 - 13
n(Q U R) = 89