{何/いく} + Counter + か
文法の解説は英語です。
用法
When combining 何 or いく with a counter and か the meaning becomes "some".
例文
今日は、雪で授業を休んだ人が何人かいたそうです。
Today, I heard there were some people who didn't attend class because of the snow.
お土産にTシャツを何枚かかった。
As an omiyage I bought some shirts.