Problem:
Gilda has a bag of marbles. She gives of them to her friend Pedro. Then Gilda gives of what is left to another friend, Ebony. Finally, Gilda gives of what is now left in the bag to her brother Jimmy. What percentage of her original bag of marbles does Gilda have left for herself?
Answer Choices:
A.
B.
C.
D.
E.
Solution:
Assume that Gilda starts off with marbles. After giving marbles to Pedro, she has marbles left. She then gives marbles to Ebony, with her having marbles left. Finally, Gilda gives marbles to Jimmy. She has a total of marbles left, which is of her original total.
Thus, the correct answer is .
Answer: .
The problems on this page are the property of the MAA's American Mathematics Competitions