Knowing that the sum of all interior angles of any triangle is 180 degrees, we can find the measurement of the missing angle of the triangle. The calculation is 180 - 75 - 40 = 65. Then, notice that the blue angle and the missing angle are supplementary (linear; add up to 180 degrees). So we can find the blue angle's measurement by 180 - 65, so the answer is 115 degrees.
Mandy Increases her books by 2 per month. Bill increases his books by 4 per month.
Month Mandy Bill May 18 4 June 20 8 July 22 12 August 24 16 Sept 26 20 Oct 28 24 Nov 30 28 Dec 32 32 At the end of December they will have read the same amount of books.
