[>>Eslam Mohammed<<]

R1:R2:R3 = 16:24:48
R1 = 16x
R2 = 24x
R3 = 48x
المقاومة المكافئة Rt
1/Rt = 1/R1 + 1/R2 + 1/R3
1/Rt = 6/48x = 1/8x
Rt =8x

V = I R
6 = 3*8x
x = 1/4
R1 = 4
R2 = 6
R3 = 12