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PS Question_Set 1

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Junior | Next Rank: 30 Posts
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PS Question_Set 1

by [email protected] » Thu Jun 04, 2009 4:27 am
The age of the Earth is approximately 1.3*10^17 seconds, and one year is approximately 3.2*10^7 seconds. Which of the following is closest to the age of the Earth in years?
A. 2.5*10^9
B. 4.1*10^9
C. 1.9*10^10
D. 2.5*10^11
E. 4.1*10^11


Thankyou for the help.

Regards,
N
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by mike22629 » Thu Jun 04, 2009 4:49 am
First reduce powers of 10

1.3*(10^17)/ 3.2*(10^7) = 1.3*(10^10) / 3.2

Then,

1.3*10*(10^9) / 3.2 = 13*(10^9) / 3.2

13/3.2 = 4.1

Ans = 4.1*(10^9)
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Junior | Next Rank: 30 Posts
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by [email protected] » Thu Jun 04, 2009 9:41 am
Thanks so much- Guess was calculating something incorrectly:-)

Regards,
N
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