If the heart beats 75 times in 30 seconds, it means we can generalize and say:
After 30 seconds:
75 beats in 30 seconds
After 1 minute:
75 beats + 75 beats = 150 beats in 30 seconds + 30 seconds = 1minute.
i.e.
150 beats in 1 minute.
This means that if b is the number of beats and m is the number of minutes;
we can say:
[tex]b=150m[/tex]
