Question 27142
First side = x
Second side is 4 more than the first = (x+4)
Third side is half the second = (x+4)/2

Total length = 60

First side + second side + third side = total length
x             + (x+4)           + (x+4)/2 = 60

2x+4 + (x+4)/2 = 60

4x +  8 + x +4 = 120

5x + 12 = 120

5x = 108

x = 21.6 ( I think...this is a mental calculation so forgive me if i'm wrong.

Test : x + (x+4) + (x+4)/2 = 21.6 + 25.6 + 12.8 = 47.2 + 12.8 = 60, yes, it seems to be the right answer.