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Body Estimates

How well do you make know facts regarding aspects of your body? For the following, form some reasonable assumptions and use mathematics to make some reasonable estimates that will help pick the correct option.

Every day, blinking causes the eye to be closed for a total of:

  • 45 seconds
  • 12 minutes
  • 30 minutes
The average human circulatory system is:
  • 50 - 60 miles long
  • 5,000 - 6,000 miles long
  • 60,000 - 100,000 miles long
In an average lifetime, the hair on the head grows:
  • 5 feet
  • 25 feet
  • 150 feet




Suggested Answers: Scroll down.......



30 minutes, 60,000-100,000 miles, and 25 feet respectively.

Source: Adapted from Modern-Day Almanac, 1982, p.77