Question

A blue whale's heart beats only 45 times in 5 minutes. Write an equation comparing the number of beats to the number of minutes. At that rate, how many times would the blue whale's heart beat in 20 minutes?

Answer 1

45 times in 5 minutes.......45/5 = 9 times per minute

y = 9x.....where y is the total heartbeats and x is the number of minutes

in 20 minutes....sub in 20 for x

y = 9x
y = 9(20)
y = 180 <=== so it would beat 180 times in 20 minutes

Answer 2

Divide 45 with 5 to find out the amount of times the whale's heart beat per minute

45/5 = 9

9 times per minute

Now multiply 9 with 20

20 x 9 = 180

A whale's heart beats 180 times in 20 minutes

hope this helps