Problema Solution

to mail a first class letter, the U.S. postal service charges $.34 for the first ounce and $.21 for each additional ounce. It costs $1.18 to mail your letter. How many ounces does your latter weigh?

Answer provided by our tutors

let


x = the weight of the letter in oz


1*0.34 + (x - 1)*0.21 = 1.18


by solving we find


x = 5 oz


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the letter weights 5 ounces.