Final answer:
There are 60 beats in 3 minutes.
Step-by-step explanation:
In this question, we are given that on a double number line, 3 minutes corresponds to 180 beats. To find how many beats are there in 3 minutes, we can set up a proportion:
3 minutes = 180 beats
x minutes = ? beats
We can cross multiply and solve for x:
3 minutes × ? beats = 180 beats × x minutes
? beats = 180 beats × x minutes / 3 minutes
? beats = 60 beats/minute
Therefore, there are 60 beats in 3 minutes.