Results 1 to 7 of 7

Math Help - fractions URGENT!!!

  1. #1
    Newbie
    Joined
    Oct 2007
    From
    london
    Posts
    19

    fractions URGENT!!!

    guys im stuck on these 2 Q's and its due in for tomorow plz can some1 explain it properly:
    charlie cycles 5 and 5 over 8( a fraction) miles in three quatres of an hour.
    a. at what speed does he cycle in miles per hour?
    b. at the same speed,how far would he cycle in 5o minutes?

    the outside measurements of a picture frame are 12 and one tenths( 1 over 10)cms and 6 and 3 over 4 cm.the frame is 1 over 2 cm wide.
    what is the area of the picture?
    thankyou
    Last edited by help_me; October 16th 2007 at 01:32 PM.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by help_me View Post
    guys im stuck on this Q plz can some1 explain it properly:
    charlie cycles 5 and 5 over 8( a fraction) miles in three quatres of an hour.
    a. at what speed does he cycle in miles per hour?
    recall that \mbox{Speed }= \frac {\mbox{Distance}}{\mbox{Time}}

    I change 5 \frac 58 to \frac {45}8

    So he cycles \frac { \left( \frac {45}8 \right) \mbox { miles}}{ \left( \frac 34 \right) \mbox { hour}} = \frac {\frac {45}8}{ \frac 34} mph

    can you solve that?

    b. at the same speed,how far would he cycle in 5o minutes?
    after you find the speed from part (a), use the fact that \mbox { Distance} = \mbox {Speed} \times \mbox {Time} and plug in the speed and time to solve for distance

    here, put the time as \frac 56 hours
    Follow Math Help Forum on Facebook and Google+

  3. #3
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by help_me View Post
    the outside measurements of a picture frame are 12 and one tenths( 1 over 10)cs and 6 and 3 over 4 cm.the frame is 1 over 2 cm wide.
    what is the area of the picture?
    thakyou
    you need to learn how to type fractions better.

    i suppose you mean the outside measurements of the frame are 12 \frac 1{10} cm by 6 \frac 34 cm. and the frame is 1/2 cm thick (that is, its border around the picture is 1/2 cm)

    Now 12 \frac 1{10} = \frac {121}{10}

    and 6 \frac 34 = \frac {27}4

    so the length of the picture will be \left( \frac {121}{10} - 1 \right) cm. (since we subtract 1/2 cm at the top and bottom for the picture frame)

    and the width of the picture is \left( \frac {27}4 - 1 \right) cm (since we subtract 1/2 cm from both sides for the picture frame)

    So the area of the picture is: \mbox{length} \times \mbox{width} =\left( \frac {121}{10} - 1 \right)  \left( \frac {27}4 - 1 \right)


    can you take it from here? work out what are in the brackets first
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Oct 2007
    From
    london
    Posts
    19

    hmm...

    would the anwser to a. be 7 and 1 over 2?
    would b. be 6 and 1 over 4?
    hey how did u work out da time to be 5 over 6?sorry i didnt understand...........
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Oct 2007
    From
    london
    Posts
    19

    ummm

    would da second q's anwser be 63 and 33/40?
    Follow Math Help Forum on Facebook and Google+

  6. #6
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by help_me View Post
    would the anwser to a. be 7 and 1 over 2?
    yes

    would b. be 6 and 1 over 4?
    yes

    hey how did u work out da time to be 5 over 6?sorry i didnt understand...........
    i needed to know what fraction of an hour is 50 minutes. now i know that 1 hour = 60 minutes. so (1/60)hour = 1 minute. multiply both sides by 50, we get: (50/60)hour = 50 minutes

    Quote Originally Posted by help_me View Post
    would da second q's anwser be 63 and 33/40?
    yes. (with cm^2 as the units)
    Last edited by ThePerfectHacker; October 20th 2007 at 05:20 PM.
    Follow Math Help Forum on Facebook and Google+

  7. #7
    Newbie
    Joined
    Oct 2007
    From
    london
    Posts
    19

    thanks sooo much

    ure a life saver!
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 4
    Last Post: September 20th 2010, 02:32 AM
  2. Replies: 0
    Last Post: April 28th 2010, 09:53 AM
  3. Urgent!!!help with attempted questions - urgent
    Posted in the Statistics Forum
    Replies: 2
    Last Post: February 28th 2010, 12:29 AM
  4. Replies: 3
    Last Post: February 26th 2009, 11:30 AM
  5. I need urgent urgent hel with this parabola question
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: December 14th 2008, 04:48 PM

Search Tags


/mathhelpforum @mathhelpforum