Question

tiffany read x/3 books last month. Her brother read (4/9x-15) books and her sister read x/9 fewer books than tiffany. express the total number of books read in terms of x. show your work.

Answer 1

Tiffany: x/3 books

Brother: (4/9)x - 15 books

Sister: x/3 - x/9

Total: x/3 + (4/9)x - 15 + x/3 - x/9

The LCD here is 9. Mult. all terms by 9 and simplify the resulting expression:

3x + 4x - 135 + 3x - x = 7x + 3x - x - 135 = 9x - 135 books (answer)