Step by step show answer for problem 3-3×6+2

Imagine a new pasture with grass growing on it. every day after the seeds have germinated, the number of blades of grass in the pasture triples. after 18 days, the entire pasture is completely covered in grass. how many days did it take for the pasture to be one-third covered in grass?

Can someone me out here number 4 plz

Me. i can't figure out this question. give an explanation too. .