Manga Math Mysteries 5: The Ancient Formula: A Mystery With Fractions

A puzzle from Sifu's grandfather has everyone stumped. A circle divided into wedges shows part of the formula for an ancient medicine. But some wedges?and another circle?are blank, and no one knows how the original formula disappeared! Joy, Adam, Amy, and Sam will have to use cluesand fractions?to discover the truth about... THE ANCIENT FORMULA