Calculate the perimeter of a rectangle that is 45 cm long and 2/3 of the length wide.

According to the condition of this problem, it is required to determine the perimeter of the rectangle. In the condition, we are given the length of this rectangle – 45 centimeters, and we also know that its width is 2/3 of the length.

To determine the numerical value of the width of the rectangle, we must multiply the length by the fraction 2/3, or, more simply, divide 45 by 3 and multiply the result by 2. The formula for calculating the perimeter of this rectangle will be:

(45 + (45/3) * 2) * 2 = (45 + 15 * 2) * 2 = (45 + 30) * 2 = 75 * 2 = 150 cm;

Answer: The perimeter of the given rectangle is 150 cm.