Answer:
,
Where,
a = number of ants,
l = number of legs.
Explanation:
Given,
The number of legs an ant has = 6,
The number of legs a ants have ( say l ) = a × 6

∵ by the equation,
We get,
I ∝ a
i.e. the required proportional relation is,

Note : a relation is called proportional if output value is directly proportional to input value.