Question 1189607
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                    It can be solved  MENTALLY.



<pre>
From the condition, for every 3 problems solved correctly, should be 5 problems solved incorrectly.


So, we can divide 24 problems in groups, combining 3+5 = 8 such problems in each group.


The number of groups is 24/8 = 3, which gives the


<U>ANSWER</U>.  3*3 = 9 problems solved correctly and 3*5 = 15 problems solved incorrectly.
</pre>

Solved &nbsp;(mentally, &nbsp;without using equations).



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