Question 188530
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Let <i>x</i> be the number of 32 cent stamps.  Since there are 38 stamps total, the number of 20 cent stamps must be 38 - <i>x</i>.


Since 32 cent stamps cost 32 cents each, the amount she spent on 32 cent stamps must be 32<i>x</i> cents.  Likewise, the amount spent on 20 cent stamps must be 20(38 - <i>x</i>).  The total amount spent is $9.88, but since the amount for each kind of stamp is expressed in cents, we will change $9.88 to 988 cents.  Now we can say:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \  32x + 20(38 - x) = 988]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \  32x + 760 - 20x = 988]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \  12x = 228]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \  x = 19]


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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