Posted by **Maddy** on Tuesday, August 13, 2013 at 5:51am.

Hi I have a maths problem I can't figure out please someone help.

Zac had some 2c stamps and 5c stamps.he needed to put 30c on a postcard to mail it.what combinations of stamps could he use.

- Maths -
**Reiny**, Tuesday, August 13, 2013 at 7:54am
Assuming we can pay using either all 2c or 5c stamps...

let's start with

0 2c ----> 6 5c

1 2c ----> leaves 28 c, can't be done with 5c's

..

5 2c ---> leaves 20 c, paid with 4 5c

..

10 2c ---> 2 5c

15 2c ---> 0 5c

so in the form (2c , 5c) we have

(0,6) , (5,4), (10,2), and (15,0)

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