The two sides of the rectangle are 3: 5 and the perimeter is 14.4cm. Find the sides of the rectangle.

Let’s solve the problem using the equation.

Let one side of the rectangle be 3x, then the other is 5x. Let’s compose and solve the equation:

(3x + 5x) × 2 = 14.4;

8x × 2 = 14.4;

16x = 14.4;

x = 14.4: 16;

x = 0.9.

0.9 × 3 = 2.7 (cm) – one side of the rectangle;

0.9 × 5 = 4.5 (cm) – the second side of the rectangle.

Answer: The sides of the rectangle are 2.7 cm and 4.5 cm, respectively.