Math CentralQuandaries & Queries


Question from Bill:

This Tuesday is my birthday and I will be 69. and I just wanted to know life ear is say earth is 6 billion years old I'm just curious to what percentage does my existence on earth represent I do realize that it's a flash in the pan

Hi Bill,

Let's try something with smaller numbers.

15 is what percentage of 25?

15, as a fraction of 25 is $\large\frac{15}{25} \normalsize = 0.6.$ To convert this to a percentage multiply by 100 so 15 is $0.6 \times 100 = 60\%$ of 25.

Now use the same procedure for

69 is what percentage of 6,000,000,000?


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