SOLUTION: Nigel has a stack of 4 pence stamps and 5 pence stamps. What is the largest number of pence that he cannot make up by using these stamps?

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Question 987754: Nigel has a stack of 4 pence stamps and 5 pence stamps. What is the largest number of pence that he cannot make up by using these stamps?
Answer by CubeyThePenguin(3113) About Me  (Show Source):
You can put this solution on YOUR website!
https://artofproblemsolving.com/wiki/index.php/Chicken_McNugget_Theorem

4 * 5 - 4 - 5 = 11