Math destroyer problem

[qkrgkssk]

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The only money that Jack has in his pocket is a quarter, 2 dimes, and a nickel. For how many sum of money does Jack have the exact change?

I need help with this problem~
Thank you for the help 🙂

 

[Rynomachine]

5, 10, 15, 20, 25, 30, 35, 40, 45, 50

then count

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[DAT Destroyer]

The only money that Jack has in his pocket is a quarter, 2 dimes, and a nickel. For how many sum of money does Jack have the exact change?

I need help with this problem~
Thank you for the help 🙂

You have 1Q 2D and 1 N
To give the exact change you can either give 1Q or 1D or 1N etc...
If you list all the possibilities you get:
Q D N
DD DQ DN QN
QDD QDN and you can't use DDN Wich adds up to 1 Q ( already used)
QDDN

Hope this helps