One side of the rectangle is 1.2 times larger than the second side and 1.8 cm smaller

One side of the rectangle is 1.2 times larger than the second side and 1.8 cm smaller than the third. Find the perimeter of this triangle if its largest side is 60 cm.

Sides of the triangle a, b, c.
Let’s say a = 1,2 b, then the largest side
c = a + 1.8 = 60.
Let’s calculate:
a = 60 – 1.8 = 58.2;
b = a: 1.2 = 58.2: 1.2 = 48.5.
Perimeter of a triangle P = a + b + c,
P = 58.2 + 48.5 + 60 = 166.7.
Answer: The perimeter of the triangle is 166.7 cm.