Question

Out of 30 questions, Ahmad answer 12 of them incorrectly. What percent of the questions did he answer correctly?

Answer 1

First, you would need to determine how many questions he got correct. 
30 - 12 = 18

Next, you would need to create an equation for this problem. Let x represent the unknown percentage. 
$\frac{18}{30}$ = $\frac{x}{100}$

Now, you would cross multiply. 
30x = 1,800

The last step would be to isolate the x. To do this, you would divide both sides of the equal sign by 30. 
x = 60

Ahmad got 60% of the questions correct. 

I hope this helps!