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5:9 = 45;x
5x = 45*9
5x = 405
x= 81
sudt matematika = 45
sudut bahasa indonesia = 81
sudut b. inggris = 90
maka sudut ipa = 360-(45+81+90) =144
144/360 *x = 32
0,4x = 32
x= 80
seluruh siswa = 80
yg gemar B.indonesia
81/360*80 = 18