On an irrigation plan, 1 inch = 10 feet; what is the real distance for a plan measurement of 5.5 inches?

On an irrigation plan, 1 inch = 10 feet; what is the real distance for a plan measurement of 5.5 inches?

• A. 5.5 feet
• B. 50 feet
• C. 60 feet
• D. 55 feet

Answer: (D)

Understanding plan-to-field scale conversions is key here: if 1 inch on the plan represents 10 feet in reality, you multiply the plan measurement by 10 to get the real distance. For a plan measurement of 5.5 inches, multiply 5.5 by 10 to get 55 feet. So the real distance is 55 feet. The other options would require different plan measurements (for example, 5 inches would give 50 feet, and 6 inches would give 60 feet), or would treat the scale as 1 inch equals 1 foot, which isn’t the case here.

Understanding plan-to-field scale conversions is key here: if 1 inch on the plan represents 10 feet in reality, you multiply the plan measurement by 10 to get the real distance. For a plan measurement of 5.5 inches, multiply 5.5 by 10 to get 55 feet. So the real distance is 55 feet. The other options would require different plan measurements (for example, 5 inches would give 50 feet, and 6 inches would give 60 feet), or would treat the scale as 1 inch equals 1 foot, which isn’t the case here.