Answer:
There are 520 sheep on Farm B.
Explanation:
Let the Number of sheep on farm B be x
Given:
On a farm A 4/5 of the number of sheep are equal to 1/2 of the number of sheep on farm B.
It means Number of sheep on farm A multiplied by 4/5 is equal to 1/2 multiplied by Number of sheep on farm B.
framing the equation we get;

Number of sheep on Farm A =

Now Given:
Total Number of sheep =845.
We know that Total Number of sheep is equal to sum of sheep at farm A and sheep at farm B.
Framing equation we get;

Taking L.C.M we get;

Number of sheep on Farm B = 520 sheep
Number of sheep on Farm A =

Hence There are 520 sheep on Farm B.