A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 5 years ago

colored copies cost .10 cents white copies cost .5cents sandy make 400 copies , some of which were colored and the rest white. her total was $22.50. how many colored copies and how many white did she made?

  • This Question is Closed
  1. myininaya
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    let colored copies be represented by C let white copies be represented by W .10C+.5W=22.50 C+W=400

  2. myininaya
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    sine C+W=400, then W=400-C. so .10C+.5(400-C)=22.50 .10C+200-.5C=22.50 -.4C+200=22.50 -.4C=22.50-200=-177.5 C=-177.5/(-.4)=443.75 But thats impossible since Sandy only made 400 copies

  3. myininaya
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    did you mean white copies cost .5 cents or .05 cents?

  4. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    .05 cents

  5. myininaya
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    ok so we have .10C+.05W=22.50 C+W=400 implies W=400-C so .10C+.05(400-C)=22.50 .10C+20-.05C=22.50 .05C+20=22.50 .05C=22.50-20=2.5 C=2.5/(.05)=50 since W=400-C, then W=400-50=350

  6. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i did it like this..c+w=400 .10c+5w=22.50 multiply#1 equation by .10 .10c-10w=17.50 add#3 equation and #2 400c=17.50 c=228 w+228=400

  7. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    but it doesn't match with the price:(

  8. myininaya
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    ok did you understand how I got W=350 and C=50?

  9. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    no how???

  10. myininaya
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    C+W=400 I solved for W and got W=400-C then I plugged this into the other equation

  11. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok now i got it thank you you save me from failing algebra :)

  12. myininaya
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    lol k

  13. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i got another ???

  14. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    an airplane flew for 5 hours with a tail wind of 25km/h. The return flight against the same wind took 5.5 hours. find the speed of the plane in still air

  15. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.