问题描述：
英语翻译
A batsman is out for 26 runs,which raises his batting average for the season from 15 to 16.How many runs would he have had to have scored to raise his average to 20.求翻译,
A batsman is out for 26 runs,which raises his batting average for the season from 15 to 16.How many runs would he have had to have scored to raise his average to 20.求翻译,
问题解答：
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