A cricketer's average in his first 18 innings was 16.5 runs.
After a further 8 innings, his average had increased to 32.5 runs.
What was his average for the last 8 innings?
Note: you don't need any cricket skills to solve this puzzle, nor do you need to know what an innings consists of.
Hint: Work out the total number of runs after the first 18 innings.
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