Question

Joanna ran a mile in physical education class. After resting for one hour, her heart rate was 60 beats per minute. If her heart rate decreased by 2/5 what was her heart rate immediataly after ahe ran the mile?

Answer 1

Let

x------> Joanna's heart rate immediately after ran the mile

we know that

`(x-(2)/(5)*x)=60`

`(3)/(5)  *x=60 \\\\x=(60*5)/(3)  \\ \\x=100\ beats\ per\ minute`

therefore

the answer is

`100\ beats\ per\ minute`