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3 December, 23:38

Neil needs to mail a CD to friend. he uses 40-cent stamps and 7-cent stamps to pay $2.56 in postage. how many of each stamp did he use

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Answers (2)
  1. 4 December, 00:31
    0
    Answer: He simply used five forty cent stamps and eight seven cent stamps.

    Step-by-step explanation:

    Multiply 5*.40 and you should get 2/$2.00

    Next, multiply 5*7 and you should get 56

    Last, add the $2 and 56 cent and you should get $2.56 as your final answer.
  2. 4 December, 01:00
    0
    Answer:He used five 40-cent stamps and eight 7-cent stamps.

    Step-by-step explanation:

    Let x represent the number of 40-cent stamps that he used.

    Let y represent the number of 7-cent stamps that he used.

    41 cents = 40/100 = $0.40

    7 cents = 7/100 = $0.07

    He uses 40-cent stamps and 7-cent stamps to pay $2.56 in postage. It means that

    0.4x + 0.07y = 2.56

    Multiplying through by 100, it becomes

    40x + 7y = 256

    7y = 256 - 40x

    We would test for corresponding values of x and y that satisfies the equation and they must be whole numbers.

    If x = 4,

    7y = 256 - 40 * 4 = 96

    y = 96/7 = 13.71

    If x = 5,

    7y = 256 - 40 * 5 = 56

    y = 56/7 = 8
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