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360-230 = 130
130/20 x50 = 13*25= 325
50 = 1/18 × x
50 : 1/18 = x
50 × 18 = x
900 = seluruh siswa
Banyak siswa yg menggunakan kendaraan umum
= (360 - (90+120+20)) / 360 × 900
= 130/360 ×900
= 130 × 2.5
= 325 siswa a.
Jadikan yg terbaikk makasihh