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Joanie wants to mail a package that requires ​$1.23 in postage. If she has only 5​-cent and 7​-cent ​stamps, what is the smallest number of stamps she could use that would total exactly ​$1.23​?

Question

Joanie wants to mail a package that requires ​$1.23 in postage. If she has only 5​-cent and 7​-cent ​stamps, what is the smallest number of stamps she could use that would total exactly ​$1.23​?

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Step 1

Given that, we have two types of stamps, one is of 5 cents and another is of 7 cents.

The total amount of stamp,

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Step 2

We need to minimize the number of stamps. So, we can take a smaller number of 5 cent stamps.

Let, y be the total number of stamps, and x be the number of 5 cent stamps. So,

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Step 3

Both x and y are positive integers. And these values...

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