The perimeter of the rectangle is 9dm2cm. The length of one side is 3dm5cm. Find the length of the second side.

We translate these measurements into centimeters, 1 dm = 10 cm, 9 dm 2 cm = 90 cm + 2 cm = 92 cm, 3 dm 5 cm = 30 cm + 5 cm = 35 cm.
The perimeter of the rectangle is found by the formula P = 2 (a + b).
Substitute the known data into the formula, and find the length of the second side of the rectangle.
2 (35 + b) = 92;
35 + b = 92: 2;
35 + b = 46;
b = 46-35;
b = 11.
The length of the second side of the rectangle is 11 cm or 1 dm 1 cm.
Answer: 1 dm 1 cm.