hey jack!
the playground problem  
sally rippin * stephanie spartels
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The Hey Jack! series’ 48-page chapter books fill the need for a cool, real-life boys’ series for early readers. Hey Jack! is full of down-to-earth, realistic stories, with word art or illustration on every second page and no more than 50 words per page. Jack’s enormous imagination injects the series with fun and humor, and the books are carefully typeset to provide reading breaks.
 
Jack's friend Billie is away, so he hangs out with Alex instead. It's lots of fun, but when Billie comes back it turns into The Playground Problem.