21 is $75 \%$ of what number?
Final Answer: \(\boxed{28}\)
Step 1 :Set up the equation: \(21 = 0.75 * x\)
Step 2 :Solve for x: \(x = \frac{21}{0.75}\)
Step 3 :Calculate the value: \(x = 28\)
Step 4 :Final Answer: \(\boxed{28}\)