Math (hard)

posted by .

Postcard stamps are 20 cents each, while letter stamps are 33 cents each. If you have 50 stamps worth $12.60, how many of each type do you have?

I don't even know where to begin with this Q.

  • Math (hard) -

    let the number of 20 cent stamps be x
    then the number of 33 cent stamps is 50-x

    solve:
    20x + 33(50-x) = 1260

  • Math (hard) -

    After solving the equation i get 3.9=x
    ??? isnt there a way you can solve it by letting x= number of postcard stamps and then y= number of letter stamps?

  • Math (hard) -

    sure:
    number of postcards stamps x
    number of letter stamps y

    x + y = 50
    20x + 33y = 1260

    from the first:: y = 50-x
    then in the second

    20x + 33(50-x) = 1260

    well, look at that! I had that in the first line.

    solution:
    20x + 1650 - 33x = 1260
    -13x = -390
    x = 30
    then y = 50-x = 50-30 = 20

    (how did you get a decimal??? of 3.9x ? )

  • Math (hard) -

    THANK YOU!!!!!! sorry! i feel like a waste of time for you, but im just not that smart ;)

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. math

    suppose you bought some 32 cents stamps and some 20 cents stamps. you spent $3.92 for 16 stamps. how many of each stamp did you buy?
  2. intermediate algebra

    A business executive bought 40 stamps for $13.68. The purchase included 37 cents stamps and 23 cents stamps. How many of each type of stamp were bought?
  3. 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 stamps. …
  4. 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?
  5. 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?
  6. maths.

    Alice spent some money on 60 stamps of two different values. The values of stamps could be 5-cents, 10-cents,20-cents and 30-cents. The total amount of money he spent was between $5 and $10. 2/5 of the tamps cost 4/3 times as much …
  7. Algebra

    Word Problems (Addition/Elimination Method). Check if my answers are correct. 1.A girl bought 2 CDs and 3 DVDs for $92. Each DVD costs $4 more than the CDs. What is the price of each CD and DVD?
  8. Maths

    Hi I have a maths problem I can't figure out please someone help. Zac had some 2c stamps and 5c stamps.he needed to put 30c on a postcard to mail it.what combinations of stamps could he use.
  9. 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 the …
  10. Math please help

    Carol has a collection of 100 stamps the graph below shows the percentage of stamps she has from each country how many more of Carols stamps are from France than from Norway?

More Similar Questions