Answer: 17 bags.
Step-by-step explanation:
We can think of the area of the path, as the difference between the area of a circle with a radius of 9ft (the 7 ft of the circular garden plus the 2ft of the path) and the area of a circle with a radius of 7ft.
Remember that the area of a circle with radius R is:
R = pi*R^2
Where pi = 3.14
Then the area of the path will be:
A = 3.14*(9ft)^2 - 3.14*(7ft)^2 = 100.48 ft^2
Now, we know that Mr. Tomas needs 1 bag of stones for every 6 square feet of path.
Then let's see how many times we have 6ft^2 in the 100.48 ft^2 of the area, this is equal to the quotient between 100.48 ft^2 and 6ft^2
N = (100.48 ft^2)/( 6ft^2) = 16.75
This means that we will need 16.75 bags of stones, but we can not have a 0.75 of a bag, then we should round up our number to 17.
Then Mr. Tomas will need 17 bags of stones to cover his garden path.
