Jawabanmu

2014-06-18T20:58:33+07:00
B-a = 120
6-3 = 120
3 = 120
 \frac{120}{3}
= 40 

a = 3(40) = 120
b = 6(40) = 240
c = 8(40) = 320

a+b+c = 120+240+320 = 680

2014-06-18T20:58:33+07:00
A:b:c = 3:6:8
b-a = 120
b-a = 120
6x-3x = 120
3x = 120
x = 40

a = 3.40 = 120
b = 6 40 = 240
c = 8.40 = 320

a+b+c
120+240+320
=680

:)