Question

6666=4 how it is possible

Answer 1

add 6+6+6+6 is 24.
now divide 24 with 6 u get 4.

Answer 2

As I have answered to your another question you just need to count the circles in numbers if it's 1267 the answer is 1... As the same way 6666 it has 4 circles so it's 4...
I hope it helps you .