Question

6. Sarah counted her heartbeats after running. In 20 seconds, she counted 45 heartbeats. At that rate, what was her number of heartbeats per 1 min. (60 seconds)?
495


135


273


132

Answer 1

20×3 is 60 and if Sarah counted 45 beats in 20 seconds you'd multiply 45 by 3 so it would be 135.

Answer 2

Answer:

135 beats per minute

Step-by-step explanation:

1.) Find how many times the original time (20 seconds in this scenario) will multiply into 60 seconds.

2.) To find that divde the total to the given information

                           60 seconds/20 seconds = 3

3.) Multiply 45 seconds (given information) by three and your answer should be correct.

                                   45 x 3 = 135 beats per minute