problem 9: spiral review\nmentally evaluate the quantity.\n3 is what percent of 12?

Explanation:

Step1: Set up percentage formula

Let $x$ = the unknown percent. The formula is $\frac{3}{12} = \frac{x}{100}$

Step2: Simplify the left fraction

$\frac{3}{12} = \frac{1}{4} = 0.25$

Step3: Solve for $x$

$x = 0.25 \times 100$

Answer:

25%