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Education > Algebra help > Re: Help - simp...
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Re: Help - simple algebra

by "Brian M. Scott" <b.scott@[EMAIL PROTECTED] > Mar 20, 2008 at 07:29 PM

On Thu, 20 Mar 2008 22:58:54 GMT, Martin
<martin.wilkins50@[EMAIL PROTECTED]
> wrote in
<news:O_BEj.14454$jH5.8429@[EMAIL PROTECTED]
> in
alt.algebra.help:

> How do you solve this problem

> If Sally can paint a house in 4 hours, and John can paint
> the same house  in 6 hour, how long will it take for both
> of them to paint the house  together?

> 	2 hours and 24 minutes
> 	3 hours and 12 minutes
> 	3 hours and 44 minutes
> 	4 hours and 10 minutes
> 	4 hours and 33 minutes

> Apparently it's 2 hours and 24 minutes

In one hour Sally paints 1/4 of the house, and John paints
1/6 of the house, so between them they can paint 1/4 + 1/6 =
5/12 of the house in an hour.  To paint the whole house will
therefore take them 1/(5/12) = 12/5 hours, or 2 hr. 24 min.

Brian
 




 6 Posts in Topic:
Help - simple algebra
Martin <martin.wilkins  2008-03-20 22:58:54 
Re: Help - simple algebra
mathedman@[EMAIL PROTECTE  2008-03-20 18:28:10 
Re: Help - simple algebra
Virgil <Virgil@[EMAIL   2008-03-20 17:28:05 
Re: Help - simple algebra
"Brian M. Scott"  2008-03-20 19:29:06 
Re: Help - simple algebra
Stan Brown <the_stan_b  2008-03-20 19:09:23 
Re: Help - simple algebra
Barb Knox <see@[EMAIL   2008-03-21 18:36:37 

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