Question 317216
Let x = the length of the second side

The first side is 5 metres longer, so the first side is x+5

The third side is four times the length of the second, so it is 4x.


Perimeter of a triangle, just add the 3 sides up:


P = (x+5) + x + 4x
65 = 6x + 5
60 = 6x
x = 10


The second side is 10 meters.