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perempuan = y
69x + 74y = 40(72)
69x + 74y = 2880 ---- persamaan 1
x+ y = 40 ----- persamaan 2
69x + 74y = 2880 x1
x + y = 40 x74
-----------------------------------------
69x + 74y = 2880
74x + 74y = 2960
----------------------------- dikurang
-5x = -80
x = -80 : -5
x = 16 (D)
perempuan = dimisalkan 40-a
72x{a+(40-a)}/40= 72
ax69 + (40-a)x74/40=72
69a +2960 -40a =72x40
-5a = -2960+2880
a=-80/-5 = 16
jawabannya = d