Question 1153521
A is the longest side
C is the shortest side

A = 2C
B = 1.5C]
C = C
D = C + 3 if i understood you correctly.


A + B + C + D = 69
convert all to C to get:
2C + 1.5C + C + C + 3 = 69
combine like terms to get:
5.5C + 3 = 69
subtract 3 from both sides to get:
5.5C = 66
solve for C to get:
C = 66/5.5 = 12


you get:
A = 24
B = 18
C = 12
D = 15


sum of all sides is 24 + 18 + 12 + 15 = 69
this confirms the solution is correct.
solution is side A = 24, B = 18, C = 12, D = 15.