Answer:
It will take 80 days for the bull calf to reach a weight of 500 kilograms.
Explanation:
Given:
The weight of a bull calf is 388 kilograms.
Now, to find the weight of bull calf of how long it will take to reach a weight of 500 kilograms, if it’s weight increases at a rate of 1 2/5 kilograms per day.
Required weight which to be increased = 500 - 388 = 112 kilograms.
Rate of weight increase =

=
Thus, the time required =

=
=
The time required = 80 days.
Therefore, it will take 80 days for the bull calf to reach a weight of 500 kilograms.