Question

a persons heart beat 100000 times in a day how many year it will take to beat 1 billion times

Answer 1

it will take 10000 days

Answer 2

1 billion =1000000000
So heart beats 100000 times in a day
It will beat 1000000000 times in (1000000000/100000) =10000 days ie, (10000/365) yrs = 27.4 yrs (if we avoid all the leap years)