Answer:
r = 728 ( there might be an easier way! )
Step-by-step explanation:
w/r = 3/8 then w = 3/8 r
b/w = 2/7 b = 2/7 w sub in the above equation b = 2/7 (3/8 r) = 6/56 r
r + w + b = 1079
r + 3/8 r + 6/56 r = 1079
r = 728
