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Recent Posts

Try a chapter from the Math Guide Online for free

A bunch of folks have asked me if there’s a free trial for the new Math Guide Online. Well, at launch there wasn’t but now there is! You may now try before you buy: anyone can view the Quadratics chapter and take the quizzes therein. You still need to be registered for at least free (more…)

Available now: SAT Math Guide Online

For the past few months I’ve been working on an online, interactive version of PWN the SAT: Math Guide, and I’m excited to announce that subscriptions are available now in the PWN store!

there are 50 questions on a quiz given to a class of a students…

there are 50 questions on a quiz given to a class of a students. Only 20% of the class answered all the questions on the quiz. Of the remaining students, half answered two-fifths of the questions and the other half answered three-fifths. What was the average number of questions answered on this quiz?