Question 1136081
.
<pre>
Let x be the number of correct answers.


Then the number of incorrect or missed is (20-x).


The balance equation is


    20 + x - (20-x) = 24.


Simplify and solve for x:


    20 + x - 20 + x = 24

    2x = 24               ===============>        x = 24/2 = 12.


<U>ANSWER</U>.  12 correct answers.


<U>CHECK</U>.  12 scores obtained and 8 scores lost.  20 + 12 - 8 = 24.   ! Correct !
</pre>

Solved.