Question

14 A normal heart beats
72 times a minute.
How many times does
it beat in a quarter of
a minute?

Answer 1

Answer:

l donot sorryyyyyyyyyyyyyyy

Answer 2

Answer:

16 times

Step-by-step explanation:

72 times for 60s

since quarter is 1/4

so , 60/4 = 15s

so for 15s the heart beats x times (let)

beat sec

72 60

x 15

cross multiply

72×15 = 60x

1080 = 60x

so, x = 1080/60

x = 16