Question

you make a scale drawing of a banner for a school dance. you use a scale of 1 inch = 3 feet. what is the actual width of the banner? the actual width of the banner is \\(\square\\) feet.

Explanation:

Step1: Set up the proportion

Given the scale \(1\) inch \( = 3\) feet. Let \(x\) be the actual width. The proportion is \(\frac{1\ \text{inch}}{3\ \text{feet}}=\frac{7\ \text{inches}}{x\ \text{feet}}\).

Step2: Cross - multiply

Cross - multiplying gives \(1\times x=3\times7\).

Step3: Solve for \(x\)

\(x = 21\).

Answer:

\(21\)