The perimeter of a rectangle is 60 cm. Find its sides if you know that one side is 6 cm larger than the other.

The perimeter of the rectangle is found by formula 2 (a + b)
The condition says that one side is 6 cm larger then, let one side be x, and the other 6 + x and make up the equation
2 (x + 6 + x) = 60
2 (2x + 6) = 60
4x + 12 = 60: 4
X + 3 = 15
X = 15 + 3
X = 18
Now we substitute 6 + x = 18
X = 18-6
X = 12
Answer: 18; 12