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Ratio and Proportions

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Salina had some local and foreign stamps. The ratio of the number of local stamps to the number of foreign stamps was 3:4. She bought 21 more local stamps and the ratio became 9:8.

a. How many foreign stamps did Salina have?

b. How many local stamps did Salina have in the end?

  • Ratio and Proportions -

    using d for domestic and f for foreign,

    d/f = 3/4
    (d+21)/f = 9/8

    42 local stamps
    56 foreign stamps

    check: 42/56 = 3/4
    63/56 = 9/8

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