On a blueprint, 1/4\"=1' means?

• A. 1 inch on the drawing equals 1 foot of actual size
• B. 1 inch on the drawing equals 4 feet of actual size
• C. 1/4 inch equals 1 foot
• D. 1 foot on the drawing equals 1 inch actual

Answer: (A)

Blueprint scales map drawing measurements to real-world size. If a notation says 1/4 inch equals 1 foot, that means every quarter-inch on the drawing represents one foot in reality. To find what 1 inch on the drawing represents, multiply by four: 1 inch on the drawing equals 4 feet in real size. In inches, that’s 4 feet or 48 inches, so the mapping is 1 inch on the drawing equals 48 inches (4 feet) in reality. This is why the correct interpretation is that one inch on the drawing corresponds to four feet of actual size.