The number of baseball games bernie won this year was 25% less than the number of games he won last year. of bernie won 24 baseball games last year, how many games did he win this year?

It is important to understand the words of the problem for solving this question.
Number of baseball games Bernie won last year = 24
Percentage of less games that Bernie won this year = 25%
Then
Number of games won less by Bernie this year = (25/100) * 24
                                                                             = (1/4) * 24
                                                                            = 6
So it can be seen that Bernie won 6 less games this year.
Now
The total number of games won by Bernie this year = 24 - 6
                                                                                   = 18
So Bernie won a total of 18 games this year. I hope the procedure is clear to you and the answer deduced is actually the one you were looking for.

Correct 8

Correct Solution:

25/100 * 24 = 5.9 = about 6
(we need to put 25 out of 100 because percentages always equal 100) (cent)

24-6 = 18 
so that is the answer

Looks pretty good to me!