Pls help and thanks

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?

Which property is illustrated by the statement given below? raj raj.

Nine more than four times a number is the same as one less than twice the number. find the number?