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The
country Sixtania prints postage stamps with only three values 6
lucres, 10 lucres and 15 lucres (where the currency is in
lucres).
Which values cannot be made up with combinations of these postage stamps? Prove that all other values can be made up.
Postage
Age 14 to 16
Challenge Level 
The
country Sixtania prints postage stamps with only three values 6
lucres, 10 lucres and 15 lucres (where the currency is in
lucres).Which values cannot be made up with combinations of these postage stamps? Prove that all other values can be made up.
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