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Let's say it takes about 5 seconds to count to ten out loud. How many years will it take to count out loud to a billion? Ignore leap years and round your answer to one decimal place.

Guest May 22, 2017
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15.9 years. Crazy, isn't it?

These type of questions are best answered with proportions:

$$\frac{5secs}{10}=\frac{xsecs}{1000000000}$$

Cross multiply and solve:

$$5000000000=10x$$

$$x=500000000secs$$ (5 hundred million seconds)

Now, let's use another proportion to solve for how many years:

$$\frac{31536000secs}{1yr}=\frac{500000000}{xyr}$$'

Cross multiply and solve again:

$$31536000x=500000000$$

$$x=\frac{500000000}{31536000}\approx15.9years!$$

That's insane! Almost 16 years!

TheXSquaredFactor  May 22, 2017

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