Question

You answer 12 out of 20 problems correct on your homework. What percent did you answer correct? What percent did you answer incorrect?

Answer 1

The answer to your question would be 60 percent all you do is divide that and move the decimal 2 places to the left.

Answer 2

Convert 12/20 into a percent to find how many were right. 
12/20 = .6= 60% (multiply by 100 and add a percentage sign)
You also got 8/20 wrong
8/20 = .4 = 40%
So 60% correct and 40% incorrect,
Hope this helps.