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yudi = 2x
iwan = 3x+2
rata2 umur mereka 31
rata2 = x+1 + 2x + 3x + 2 / 3
31 = 6x + 3 / 3
6x = 31 * 3 - 3
6x = 90
x = 15
jadi umur ani = x + 1 = 15 + 1 = 16
jadi umur yudi = 2x = 15 * 2 = 30
jadi umur iwan = 3x + 2 = 3*15 + 2 = 45 + 2 = 47
umur ani 5 tahun yang akan datang = 16 + 5 = 21
umur yudi = 2x
umur iwan = 3x+2
rata2 umur mereka = 31
maka :
rata2 = x+1 + 2x + 3x + 2 / 3
31 = 6x + 3 / 3
6x = 31 * 3 - 3
6x = 90
x = 15
jadi umur ani = x + 1 = 15 + 1 = 16
jadi umur yudi = 2x = 15 * 2 = 30
jadi umur iwan = 3x + 2 = 3*15 + 2 = 45 + 2 = 47
umur ani 5 tahun yang akan datang = 16 + 5 = 21