Question

Allie answered 72% of the questions on her math test correctly. If she answered 18 questions correctly, how many questions were on the test?

Answer 1

Answer:

25 questions

Step-by-step explanation:

The answer to this question can be solved by setting up a proportion, or equivalent ratios (fractions).  Since we know that 18 questions was equal to 72% correct on the test, we can set up a proportion to find the total number of questions:

$\frac{72}{100}=\frac{18}{x}$, where 'x' represents the total number of questions (or 100%) of the questions on the test.

Cross-multiply and divide:  72x = 18(100) or 72x = 1800

Divide both sides by 72:  72x/72 = 1800/72

Solve for x:  x = 25 questions