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Challenge 47: VCR
Figure This!
Do you always get
6 hours of recording
on a 6-hour tape?
on a 6-hour tape?
Suppose the setting SP (standard play) on a VCR allows 2 hours of recording on an ordinary 120-minute tape. Changing the setting to EP (extended play) allows 6 hours of recording. After taping a 30-minute show on SP, the VCR is reset to EP. How many more
Aerial
Polygon on TV
Need A Hint?
Proportional reasoning involves simple fractions, ratios, and probabilities. It is used by people comparing grocery prices, economists describing population densities, architects making scale models, and chemists determining the relative strengths of solu

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