Question

find the number that makes the ratio equivalent to 1:2.
□:18

Explanation:

Step1: Define the ratio equation

Let the unknown number be \( x \). The ratio \( x:18 \) should be equivalent to \( 1:2 \), so we can write the proportion \( \frac{x}{18}=\frac{1}{2} \).

Step2: Solve for \( x \)

Cross - multiply the proportion: \( 2x = 18\times1 \). Then, divide both sides by 2: \( x=\frac{18}{2}=9 \).

Answer:

9