If a human heart beats once in every 0.8 s, find the number of times it has beaten in the life of a 10 year old boy

Explanation

To solve the problem of finding the number of times a human heart beats in the life of a 10-year-old boy, we can follow these steps:

### Step 1: Determine the heart rate
The heart beats once every 0.8 seconds. To find the number of beats per minute, we can use the following calculation:

\[ \text{Beats per minute} = \frac{60 \text{ seconds}}{0.8 \text{ seconds}} = 75 \text{ beats/minute} \]
...