Answer:
7 friends got pizza
Explanation:
Tom ate
of a pizza.
So, Reaming part =

He divided the leftover pizza into pieces each equal to 1/12 of the original pizza.
Let x be the no. of grinds he gave 1/12 part pieces
So, Part of pizza given to x friends =

So, Remaining pizza =

We are given that 1/6 of the original pizza remained.
So,


Hence 7 friends got pizza