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PROBLEM:
How many heartbeats are there in a lifetime?
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SOLUTION:
The general assumptions:
- There is 1 heartbeat in 1 second
- In half a lifetime, there are 109 seconds.
Therefore, in a lifetime, the number of heartbeats is
\begin{align*}
1\:\text{lifetime} & =\left(1\:\text{lifetime}\right)\left(\frac{10^9\:\text{sec}}{0.5\:\text{lifetime}}\right)\left(\frac{1\:\text{heartbeat}}{1\:\text{sec}}\right) \\
& =2\times 10^9\:\text{heartbeats} \ \qquad \ \color{DarkOrange} \left( \text{Answer} \right)
\end{align*}
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