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27 September, 21:12

Angela bought 10 stamps that cost $1 or $1.20.

Altogether, her total was $11. How many of each $1 stamps and how many of

each $1.20 stamps did she buy?

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Answers (1)
  1. 27 September, 22:44
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    Let the first equation be x + y = 10

    x = 10 - y

    2nd equation will be 1x + 1.2y = 11

    Substituting in 2nd equation

    (10 - y) + 1.2y = 11

    10 - y + 1.2y = 11

    .2y = 1

    y = 5

    If y = 5, x = 5: coz x + y = 10
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