Please Help! This is so hard!

Question

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1098

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

Guest Jun 28, 2016

chilledz3non · Answer 1 · 2016-06-29T04:09:07

https://en.wikipedia.org/wiki/Coin_problem

According to wikipedia: "With only 2 pence and 5 pence coins, one cannot make 3 pence, but one can make any higher integral amount."

So the answer is three..?

MaxWong · Answer 2 · 2016-06-29T12:45:35

3 pence. It's impossible to make 3 pence with 4 and 5 pence stamps.

Guest · Answer 3 · 2016-08-10T05:35:45

Actually, it's 11 pence.

11=4+4+3

numbers greater than 11 can be made with 4x+5y; x, y>0