You can put this solution on YOUR website! Calculate the total number of questions, both correct and incorrect. (19+6=25)
Divide 19 by 25: (19/25=.76)
Convert the decimal to a percentage (multiply by 100)
Charles answered 76% of the questions correctly.
You could also see that there are 25 questions total and know that each question would be 4 points. (25*4=100) If he got 6 problems wrong that's 6*4 or 24 points lost. 100%-24%=76%