Question 481538
Let x be the shortest length. Then x+3 is the middle length, and 2(x+3) = 2x+6 is the longest side. Then,



x + (x+3) + (2x+6) = 45


4x + 9 = 45


4x = 36, x = 9.


The sides of the triangle are x, x+3, 2x+6, i.e. 9,12,24


Wow, terrible problem. A triangle cannot have lengths of sides 9,12,24 (this violates the triangle inequality). Tell your teacher or professor that the problem epically fails.