Final answer:
To find Tim's heart rate, we can set up a proportion: 16 beats/12 seconds = x beats/60 seconds. Cross-multiplying, we find that Tim's heart rate is 80 beats per minute.
Step-by-step explanation:
To find out how many beats per minute Tim's pulse is, we need to convert the number of beats he counted in 12 seconds to beats per minute. Since he counted 16 beats in 12 seconds, we can set up a proportion:
16 beats / 12 seconds = x beats / 60 seconds
Cross-multiplying, we get:
x = (16 beats x 60 seconds) / 12 seconds = 80 beats per minute
Therefore, Tim's heart rate is 80 beats per minute.