On the school plan with a scale of 1:100, the width of a teacher is 6cm, and the ratio of length to width is 4:3. What is the actual area of this classroom?

On the school plan with a scale of 1:100, the width of a teacher is 6cm, and the ratio of length to width is 4:3. What is the actual area of this classroom?

6 △ 3 = 2 (CM)
4 × 2 = 8 (CM) because the length is 4 parts and one part is 2cm, the length is 4 × 2
6 × 100 = 600 (CM) to calculate the actual width
8 × 100 = 800 (CM) to calculate the actual length
600 × 800 = 480000 (CM & # 178;) = 48 (M & # 178;) length × width = actual area

Move the square with an area of 64 square centimeters on the plan with a scale of 1:250 to the plan with a scale of 100 square centimeters?

According to the analysis, the side length of a square with an area of 64 square centimeters is 8 centimeters, and the side length of a square with an area of 100 square centimeters is 10 centimeters, so the scale is 10:8 = 5:41200 × 54 = 1160. A: the scale of the new map is 1160

On a plan with a scale of 1:250, a square with an area of 64 square centimeters will move to a plan with a scale of 100 square centimeters

Side length of 100 square = 10 cm
Side length of 64 square cm = 8
250:8=x：10
8x=2500
x=312.5
The scale is 1:312.5