by Susie
(morehead,ky)
If I live to be 80 years old and sleep 8 hours a day, How many years have I slept
Solution
A day has 24 hours
24 = 8 + 8 + 8
So you spent 1/3 of your time sleeping.
You can get the same answer if you do 8/24
8/24 = (8 ÷ 8) / ( 24 ÷ 8) = 1/3
All you need to do now is to find 1/3 of 80
1/3 of 80 = 1/3 × 80 = 80/3
80 / 3 = (78 + 2) / 3 = 78 / 3 + 2 / 3 = 26 + 2/3
So that is 26 years + ( 2/3 of a year)
What is 2 / 3 of a year?
Since 2 /3 of a year is a fraction of a year, the answer for 2 / 3 of a year will be in months.
1 year = 12 months.
Just find out what 2/3 of 12 is
2/3 of 12 is 2/3 times 12
2/3 times 12 = (2 times 12) / 3 = 24 / 3 = 8 months
Putting everything together, you slept for 26 years and 8 months during your lifetime.
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Learn how to derive the equation of an ellipse when the center of the ellipse is at the origin.