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no 3 b) jumlah siswa = (20-17) + 17 + (35-17)
= 3 + 17 + 18
= 38 siswa
no 4 a) ada di lampiran
no 4 b) (25-x) + x + (15-x) + 3 = 36
43 - x = 36
x = 43 - 36
x = 7 siswa
no 4 c) yg gemar mm saja = 25 - 7 = 18 siswa