math
posted by theresa .
rocio finished 21 pages of a book in 3 days. monday she finished half of what she did on tuesday and wednesday she finished twice as much as she did on tuesday. how much did she read each day?

Finished XPages on Tue.
Finished X/2 Pages on Mon.
Finished 2XPages on Wed.
X + X/2 + 2x = 21 Pages.
7x/2 = 21.
Multiply both sides by 2:
7x = 42
X = 6 Pages.
X/2 = 6/2 = 3 Pages.
2x = 2*6 = 12 Pages.