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 Post subject: Fraction. Value of XPosted: Sun May 16, 2010 4:37 pm

Joined: Sat Apr 12, 2008 6:46 pm
Posts: 5
2/7 + 3/5 = x X 3 + 1/2
x = ?

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 Post subject: Posted: Sun May 16, 2010 4:41 pm

Joined: Tue May 05, 2009 9:26 pm
Posts: 533
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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 Post subject: Posted: Sun May 16, 2010 4:43 pm

Joined: Fri Sep 15, 2006 8:51 am
Posts: 8598
... comes out with a really horrible number....

uwacla wrote:
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 XPosted: Sun May 16, 2010 4:57 pm

Joined: Fri Nov 17, 2006 8:54 pm
Posts: 1776
Location: caversham
uwacla wrote:
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

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 Post subject: FRACTION . FIND VALUE OF XPosted: Sun May 16, 2010 5:11 pm

Joined: Sat Apr 12, 2008 6:46 pm
Posts: 5
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: Posted: Sun May 16, 2010 5:28 pm

Joined: Tue Jun 02, 2009 9:28 pm
Posts: 2439
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: Posted: Sun May 16, 2010 5:32 pm

Joined: Tue Jun 02, 2009 9:28 pm
Posts: 2439
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: Posted: Sun May 16, 2010 6:03 pm

Joined: Fri Jan 15, 2010 9:39 pm
Posts: 37
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: Posted: Sun May 16, 2010 6:39 pm

Joined: Fri Nov 17, 2006 8:54 pm
Posts: 1776
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

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 Post subject: Posted: Mon May 17, 2010 4:01 pm

Joined: Tue Jun 02, 2009 9:28 pm
Posts: 2439
Spirit - I think you are right!

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