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40% × 60 = 24 lakilaki awal
24 + 12 = 36 laki laki
persen lakilaki dlm klub:
36/72 × 100% = 50%
28. siswa HANYA suka bulutangkis = 35 - 10 = 25 siswa
siswa Hanya suka sepak bola = 37 - 10 = 27 siswa
banyak siswa = 25 + 27 + 10 + 12 = 74 siswa
itu aja yang aku bisa, semoga membantu maaf kalau salah
%l = (24+12)/(60+12).100%
= 50%
27. a. {1,2,3,4,6,7,8}
b. {7}
c. {1,2,3}
28. ga bisa gambar
29. laki = x
perempuan = y
x = y-1................1
x-1 = (1/2)y; subtitusi x = y-1
y-1-1 = (1/2)y
2y-4 = y
y = 4, maka x= 3
x+y = 7 bersaudara
30. 4x + 4.(x+5) + 4.(x+2) = 196
12x+28 = 196
12x = 168
x = 14