It is given in the question that
Ms. Velez will use both x gray bricks and y red bricks to build a wall around her garden. Gray bricks cost $0.45 each and red bricks cost $0.58 each. She can spend up to $200 on her project, and wants the number of red bricks to be less than half the number of gray bricks.
Maximum she can spend is $200. That is

And

And that's the required inequalities .
15 miles cause you do 5 times 3 and you get 15 miles
Use proportions.
5/6 = x/30
6 * 5 = 30
5 * 5 = 25
x = 25
The statue is 25 feet tall.