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 Post subject: Fraction. Value of X
PostPosted: Sun May 16, 2010 4:37 pm 
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Posts: 5
Please need your help with this to solve x. Question is
2/7 + 3/5 = x X 3 + 1/2
x = ?


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 Post subject:
PostPosted: Sun May 16, 2010 4:41 pm 
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The way of working it out is:

X = (2/7 + 3/5 - 1/2) divided by 3


I hope that helps


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PostPosted: Sun May 16, 2010 4:43 pm 
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... comes out with a really horrible number....


uwacla wrote:
Please need your help with this to solve x. Question is
2/7 + 3/5 = x X 3 + 1/2
x = ?


um... 3x = 2/7 +3/5 -1/2
3x = (20+42 -35)/70
3x=27/70
x=9/70 ugh where have I gone wrong?


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 Post subject: Re: Fraction. Value of X
PostPosted: Sun May 16, 2010 4:57 pm 
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Joined: Fri Nov 17, 2006 8:54 pm
Posts: 1770
Location: caversham
uwacla wrote:
Please need your help with this to solve x. Question is
2/7 + 3/5 = x X 3 + 1/2
x = ?


left side find a common fraction, so

10/35 + 21/35 = 3x + 1/2

31/35 = 3x + 1/2 (make it easy to take away the half)

62/70 - 35/70 = 3x

27/70 = 3x

9/70 = x

messy numbers but using equivalent fractions which is KS2.

Come back Guest55 :lol:


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PostPosted: Sun May 16, 2010 5:11 pm 
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Joined: Sat Apr 12, 2008 6:46 pm
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Thanks a lot. I need one more help on this.Could you help again? Question: (1 1/2 + x) divided by 2 =3
X =?


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 Post subject:
PostPosted: Sun May 16, 2010 5:28 pm 
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Joined: Tue Jun 02, 2009 9:28 pm
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Can I just query the last step in your calculations ( I may be wrong).

In the last stage, you divide by 3.

27/70 x 1/3 = 27/210

= 9/30

= 3/10

Its a long time since I've done fractions, so I may be wrong!


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 Post subject:
PostPosted: Sun May 16, 2010 5:32 pm 
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Here goes (I may be wrong so I stand to be corrected!)

(1.5 + x)/2 = 3x

x2 1.5 + x = 6x

1.5 = 6x - x

1.5 = x (6-1)

1.5 = 5x

1.5/5 = x

Now I'm stuck! (use a calculator!)


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 Post subject:
PostPosted: Sun May 16, 2010 6:03 pm 
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Joined: Fri Jan 15, 2010 9:39 pm
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Location: Birmingham
I read q as (1.5 + x)/2 = 3
In this case then, 1.5 + x = 6
Then x = 4.5


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 Post subject:
PostPosted: Sun May 16, 2010 6:39 pm 
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Posts: 1770
Location: caversham
pheasantchick wrote:
Can I just query the last step in your calculations ( I may be wrong).

In the last stage, you divide by 3.

27/70 x 1/3 = 27/210

= 9/30

= 3/10

Its a long time since I've done fractions, so I may be wrong!


27/210=9/70 :wink:


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 Post subject:
PostPosted: Mon May 17, 2010 4:01 pm 
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Joined: Tue Jun 02, 2009 9:28 pm
Posts: 2439
Spirit - I think you are right!


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