Ben is 4 times as old as ishaan. 6 years ago, ben was 6 times as old as ishaan.
how old is ishaan now?

So let's make two equations based off the information we are given:
Let B be equal to Ben's current age
Let I be equal to Ishann's current age
 



The second equation can be expanded to:


Now using the process of elimination:
B - 6 = 6I - 36
B = 4I                *subtraction
-6 = 2I -36

Now solve for I:
-6 = 2I - 36 
30 = 2I
I = 15

Therefore Ishann is 15 years old, making Ben 60.

Hope this helps!