Jawabanmu

2014-06-18T22:23:56+07:00
Misal : x = 2n
y = 5n
z = 3n

y - z = 18
5n - 3n = 18
2n = 18
n = 9

x + y + z = 2n + 5n + 3n = 10n = 10 × 9 = 90

jadi nilai x + y + z = 90