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laki = L
Wanita = W
L + W = 40....W = 40 -l
69L + 74W / L+W = 72
69L + 74W =2.880
69l + 74(40- l) = 2.880
69l + 2.960 - 74l = 2.880
-5l = -80
l= 80/5 = 16....D