The area of the rectangle is 80 dm 2 and its width is 5 dm. How much should the length of the rectangle

The area of the rectangle is 80 dm 2 and its width is 5 dm. How much should the length of the rectangle be reduced to reduce its area by 35 dm2? Is there any superfluous given in the condition of this problem?

1. Calculate the length of the rectangle:

80: 5 = 16 dm.

2. Calculate the area of the rectangle if we reduce it by 35 dm ^ 2:

80 – 35 = 45 dm ^ 2.

3. Calculate the length of this rectangle:

45: 5 = 9 dm.

4. We calculate by how many decimeters it is necessary to reduce the length of the rectangle so that its area decreases by 35 dm ^ 2:

16 – 9 = 7 dm.

Answer: in order for the area of the rectangle to decrease by 35 dm ^ 2, its length must be reduced by 7 dm.

There is no extra data in the problem statement. All are used to solve the problem.