Problem:
Tyrone had marbles and Eric had marbles. Tyrone then gave some of his marbles to Eric so that Tyrone ended with twice as many marbles as Eric. How many marbles did Tyrone give to Eric?
Answer Choices:
A.
B.
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E.
Solution:
Let be the number of marbles that Tyrone gave to Eric. Then . Solving this equation yields .
The problems on this page are the property of the MAA's American Mathematics Competitions