Question

write and solve a proportion to answer the question.
25% of what number w is 9?
$\square = \frac{25}{100}$
$w = \square$

Explanation:

Step1: Set up the proportion

$\frac{9}{w} = \frac{25}{100}$

Step2: Cross-multiply to solve for w

$25w = 9 \times 100$

Step3: Simplify the right-hand side

$25w = 900$

Step4: Isolate w by division

$w = \frac{900}{25}$

Answer:

$\frac{9}{w}$
$w = 36$