Question 285810
(r+c)*12=336
(r-c)*14=336
divide both by 2
(r+c)*6=168
(r-c)*7=168
(r+c)*6=(r-c)*7
6r+6c=7r-7c
13c=r
substitute 13c for r in equation one
14c*12=336
7c*12=168
7c*6=84
42c=84
c=2
r=26