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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.

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

Level 10 (476 Credits)
• 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

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

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

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

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

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!

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

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

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.

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

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

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!!

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

• OM...I could never get that! LOL!

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

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