15 apples... you would divide 40 by 8 to get 5, which you will then multiply by three to get the total amount of apples needed for 40 tarts.
38.75 to one decimal place is 38.8
We know that Length = x + 16 and Width = x.
Since the perimeter of the rectangle is 2 lengths + 2 widths,
Perimeter = 2(2x + 16) = 4x + 32.
