Puzzlemaker Clip Art Gallery Lesson Plan Library Kathy Schrock's Guide for Educators Brain Boosters Learning Adventures Science Fair Central Curriculum Center On TV Young Scientist Challenge Enter Username Access resources you have created under your login. Teacher Tools such as: Lesson Plan Creator, Quiz Builder, and Worksheet Generator are no longer available. You can create new lesson plans and quizzes within your DE streaming account. If you don't have an account, sign up for a demo here.

Number & Math Play How Old?   Mary is twice as old as her brother and half as old as her father. In 22 years, her brother will be half as old as his father. How old is Mary now?   Mary is now 22 years old. From "an age-old puzzle" reappearing in The World's Most Amazing Puzzles by Charles Barry Townsend. New York: Sterling Publishing, 1993.

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