Idrissa is painting the walls of his living room. He uses 2/3 of a can of paint, and this is only enough to

cover 1/6 of the surface of his walls.Exactly how much paint does Idrissa need to cover the entire surface
of his walls?

To cover 1/6 of the surface of his walls, Idrissa used 2/3 of a can of paint.

To cover the entire surface of his walls, Idrissa would need 6 times as much paint.
So, Idrissa would need 6 * (2/3) = 12/3 = 4 cans of paint to cover the entire surface of his walls. Answer: \boxed{4}.