Question 161037
S=M-3
L=M+12
S+M+L=96
(M-3)+M+(M+12)=96
3M+9=96
3M=96-9
3M=87
M=87/3
M=29 ANSWER FOR THE MIDDLE SIDE.
S=29-3=26 FOR THE SHORT SIDE.
L=29+12=41 FOR THE LONG SIDE.
PROOF:
29+26+41=96
96=96