Answer
Find out the how many lions were ill .
To prove
Let us assume that the total number of lion in the zoo be x .
As given

10 lions packs were well.
Than the equation becomes for the total number of lion in the zoo be .


simplify the equation
2x + 60 = 6x
6x - 2x = 60
4x = 60

x = 15
Thus the total number of the lion be 15 .
As given

Than

= 5
Therefore the number of lion were ill be 5 .