Maths

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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 -

    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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