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Challenge 45: Three Squares
Figure This!
Three Squares: When do two squares make a new square?
Challenge 46: Time Zones download Adobe Acrobat PDFs and software
Time Zones: Afternoon in San Francisco, what time in Cairo, Egypt?
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Challenge 47: VCR
Polygon and her tapes
VCR: Do you always get 6 hours of recording on a 6-hour tape?
Challenge 48: Working Hours
Working Hours: How much time do teens spend on the job?
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