Ratio and Proportions

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?

asked by Dottie
  1. 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

    posted by Steve

Respond to this Question

First Name

Your Response

Similar Questions

  1. math

    Sam had a total of 80 foreign stamps and local stamps combined. After giving away 1/3 of his foreign stamps and 10 local stamps, he had an equal number of foreign stamps and local stamps left. How many local stamps did he have in
  2. math

    Sam had 80 foreign stamps and local stamps. After giving away13of his foreign stamps and 10 local stamps, he had an equal number of foreign stamps and local stamps left. How many local stamps did he have in the beginning?
  3. Math

    Sam had foreign stamps and local stamps. After giving 1/4 of his foreign stamps and 11 local stamps, he had an equal number of foreign and local stamps. How many local stamps did he have in the beginning? I got 32 for the answer
  4. math

    in an album, the ratio of the number of local stamps to the number of foreign stamps was 7 : 4. When Lucy gave away 8 local stamps and 8 foreign stamps, there were 1.8 as many local stamps as foreign stamps in the album. find the
  5. Math

    Patton is organizing his stamp collection into ab ook. He has 42 foreign stamps and 70 US stamps. He wants every page to have the same number of foreign stamps and the same number of US stamps. If he puts the greatest number of
  6. nath

    Lucy has 80 foreign stamps and 128 Philippine stamps. She separates the two kinds of stamps in her album and she puts the biggest and the same number of stamps of each kind on a page. If all pages with stamps in her album are full
  7. Algebra

    a colection of stamps consist of 2 cent stamps, 8 cent stamps, and 14 cent stamps. The number of 2 cent stamps is five more then twice the number of 8 cent stamps.the number of 14 cent stamps is three times the number of 8 cent
  8. Maths Pri 5

    The number of S's stamps is 30% of D's stamps. The number of D's stamps is 40% of B's stamps. If they have 608 stamps, how many stamps does D have? (i need a model method to answer this)
  9. Algebra

    A stamp collection consists of 3¢, 12¢, and 15¢ stamps. The number of 3¢ stamps is three times the number of 12¢ stamps. The number of 15¢ stamps is three less than the number of 12¢ stamps. The total value of the stamps in
  10. algebra

    An executive bought 300 stamps for $73.80. The purchase included 15 cent stamps, 20 cent stamps, and 40 cent stamps. The number of 20 cent stamps is four times the number of 15 cent stamps. How many 40 cent stamps were purchased?

More Similar Questions