Step 1: Understand the average concept Average score = Total runs scored / Number of innings played. Step 2: Calculate total runs in first 10 innings Average in first 10 innings = 45 runs, so total runs = \( 10 \times 45 = 450 \) runs. Step 3: Calculate total runs after 13 innings Runs scored in next 3 innings = 70 runs. Total runs after 13 innings = \( 450 + 70 = 520 \) runs. Step 4: Calculate new average New average \( = \frac{520}{13} = 40 \) runs. Step 5: Conclusion The average score after 13 innings is 40 runs.