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Math question - for the life of me I just can't figure it out!!

This is a question on a study guide I have. I am just drawing a blank and it's probably the easiest question ever lol! Anyway here's the question...

Jonathan can type a 20 page document in 40 minutes, Susan can type it in 30 minutes, and Jack can type it in 24 minutes. Working together, how much time will it take them to type the same document?

A. 5 minutes
B. 10 minutes
C. 15 minutes
D. 18 minutes
E. 20 minutes

Can you explain how you got the answer? I feel dumb, lol.

 
mamie2shoes

Asked by mamie2shoes at 3:16 PM on Jan. 21, 2011 in Just for Fun

Level 10 (476 Credits)
This question is closed.
Answers (12)
  • I think its B - 10 minutes.
    Jon types .50 pages/min
    Susan types .67 pages/min
    Jack types .83 pages/min
    Add them all together and you get 2 pages/min = 10 minutes to type a 20 page document
    hootie826

    Answer by hootie826 at 3:27 PM on Jan. 21, 2011

  • my brain ... is about....to....EXPLODE!!!!!!!!!!!!!!!!!!!!!!!!
    knicole0708

    Answer by knicole0708 at 3:24 PM on Jan. 21, 2011

  • I tired I can't figure it out either...
    But_Mommie

    Answer by But_Mommie at 3:22 PM on Jan. 21, 2011

  • Well I was going to anwser your question until i saw it was problem solving. Sorry!
    1911

    Answer by 1911 at 3:22 PM on Jan. 21, 2011

  • AHHHHHHHHHHHHHHH!!!!!!!!!!!!!!!!! I can't get the answer!
    TARARENEE

    Answer by TARARENEE at 3:22 PM on Jan. 21, 2011

  • I figured it out!!! Oh man, usually I'm so good at math. My husband told me to just google it - here's the answer. Stupid FRACTIONS!

    Jon types at 1/2 pages per minute, Susan at 2/3 pages per minute and Jack in 5/6 pages per minute.

    Each minute the three of them can complete 3/6 + 4/6 + 5/6 of a page = 2 pages.

    That's ten minutes to complete 20 pages.




    mamie2shoes

    Comment by mamie2shoes (original poster) at 3:26 PM on Jan. 21, 2011

  • Questions like these make me happy I'm done with school.
    mompam

    Answer by mompam at 3:27 PM on Jan. 21, 2011

  • Ahh, hootie, I like the way you did it better! I really hate fractions. THANK YOU!!
    mamie2shoes

    Comment by mamie2shoes (original poster) at 3:28 PM on Jan. 21, 2011

  • OM...I could never get that! LOL!
    MommyH2

    Answer by MommyH2 at 3:28 PM on Jan. 21, 2011

  • OH I know, I am starting college now after not being in school for 5 years! 2 kids later...I'm just hoping I know what I'm getting into lol
    mamie2shoes

    Comment by mamie2shoes (original poster) at 3:29 PM on Jan. 21, 2011

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