Mathematics

Question

a man used $3 to pay for 16 postage stamps. x of them are 15 cents each and the rest are 20 cents each. a) Write down an equation in terms of x and find the value of x. b) is the man supposed to receive and change? If so, find the amount

1 Answer

  • Answer:

    Step-by-step explanation:

    x = 15 cent stamps

    y = 20 cent stamps

    I will be using these equations

    x + y = 16

    0.15x + 0.20y = 3

    x = 16 - y

    0.15(16 - y) + 0.20y = 3

    2.40 - 0.15y + 0.20y = 3

    -0.15y + 0.20y = 3 - 2.40

    0.05y = 0.60

    y = 0.60/0.05

    y = 12.......there were 12 twenty cent stamps

    x + y = 16

    x + 12 = 16

    x = 16 - 12

    x = 4.....there were 4 fifteen cent stamps

    no change is received

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