The number of stamps and the cost are illustrations of unit rates
40 stamps would cost $22
The cost of 15 postage stamps is $8.25
Start by calculating the unit rate of the stamps.
[tex]Unit = \frac{8.25}{15}[/tex]
[tex]Unit = 0.55[/tex]
So, the number of stamps for $22 is calculated by dividing $22 by the unit rate.
So, we have:
[tex]Number=\frac{22}{0.55}[/tex]
[tex]Number=40[/tex]
Hence, 40 stamps would cost $22
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