The average score of a batsman in twenty matches is 15 and in twenty-five other matches is 24. Find the average score in all the forty-five matches.

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Step 1: Calculate the total runs scored in the first 20 matches.  
Total runs = Average × Number of matches = 15 × 20 = 300

Step 2: Calculate the total runs scored in the next 25 matches.  
Total runs = 24 × 25 = 600

Step 3: Calculate the total runs scored in all 45 matches.  
Total runs = 300 + 600 = 900

Step 4: Calculate the average score in all 45 matches.  
Average = Total runs / Total matches = 900 / 45 = 20

Therefore, the average score in all 45 matches is 20.

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