Question 967786
y, right answers
x, wrong answers


{{{system(x+y=20,3x+5y=76)}}}

That is if the 3 cents per wrong answer are not subtracted from the score.  
{{{system(3x+3y=60,3x+5y=76)}}}
{{{(3x+5y)-(3x+3y)=76-60}}}
{{{2y=16}}}
{{{highlight(y=8)}}}, the count of right answers


If the wrong answers are supposed to be SUBTRACTED, and all 20 questions are answered, then the system is 
{{{system(x+y=20,-3x+5y=76)}}}