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If 1 year = 3.2 x 10^7, we need to determine how many time 3.2 x 10^7 divides into 1.3 x 10^17The age of the Earth is approximately 1.3 x 10^17 seconds, and one year is approximately 3.2 x 10^7 seconds. Which of the following is closest to the age of the Earth in years?
A) 2.5 x 10^9
B) 4.1 x 10^9
C) 1.9 x 10^10
D) 2.5 x 10^11
E) 4.1 x 10^11
Note that part of the difficulty of the question comes from the complexity of having to deal with 1.3/3.2. Rather than grapple with this number, we can consider 1/3. 1/3 = .333. (So 1.3/3.2 will be a little bigger.)The age of the Earth is approximately 1.3 x 10^17 seconds, and one year is approximately 3.2 x 10^7 seconds. Which of the following is closest to the age of the Earth in years?
A) 2.5 x 10^9
B) 4.1 x 10^9
C) 1.9 x 10^10
D) 2.5 x 10^11
E) 4.1 x 10^11
Set up a PROPORTION and round values to the nearest MULTIPLE OF 10.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?
2.5*10^9
4.1*10^9
1.9*10^10
2.5*10^11
4.1*10^11
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