11 Plus Maths – Preparation and Information
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uwacla
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by uwacla »
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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Twinkle
- Posts: 580
- Joined: Tue May 05, 2009 10:26 pm
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by Twinkle »
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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hermanmunster
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by hermanmunster »
... 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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stevew61
- Posts: 1786
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- Location: caversham
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by stevew61 »
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
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uwacla
- Posts: 5
- Joined: Sat Apr 12, 2008 7:46 pm
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by uwacla »
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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pheasantchick
- Posts: 2439
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by pheasantchick »
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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pheasantchick
- Posts: 2439
- Joined: Tue Jun 02, 2009 10:28 pm
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by pheasantchick »
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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Spirit
- Posts: 37
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- Location: Birmingham
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by Spirit »
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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stevew61
- Posts: 1786
- Joined: Fri Nov 17, 2006 9:54 pm
- Location: caversham
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by stevew61 »
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