perbandingan c. x:y:z = 2:7:5 dan 3x-2y+4z=72

misalnya :
x = 2n , y = 7 n , z = 5n
3x - 2y + 4z = 72
= 3(2n) - 2(7n) + 4(5n) = 72
12n = 72
n = 6
x = 2n
= 2(6) = 12
y = 7n
= 7(6) = 42
z = 5n
= 5(6) = 30

semoga bermanfaat ^_^ !