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Joined: Oct 2008
Posts: 3,558
Forum Guardian
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OP
Forum Guardian
Joined: Oct 2008
Posts: 3,558 |
Can someone explain how you work the answer out to this on a calculator please 
Does your vacuum suck? Get a Dyson!!
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Joined: Jul 2008
Posts: 14,351 Likes: 20
Wiki Master
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Wiki Master
Joined: Jul 2008
Posts: 14,351 Likes: 20 |
Q5 Loads of ways ...
Seperating left "wing" from the rest ...
area of Left wing = 15 * 22 = 330 cm2
area of rest of item = 18 * 30 = 540 cm2
total = 330 + 540 = 870 cm2
You could separate the bottom "wing" instead
(15 * 18) + (15 * 40) = 870 cm2
you may have noticed both terms have 15 so you could have simplified to ...
(18 + 40) * 15 = 870 cm2 [note the brackets are important on this one]
voila
OR ... if you want to do the calculation in one go
15 * 22 + 18 * 30 = 870cm2 [works on modern scientific calculators)
(15 * 22) + (18 * 30) = 870 cm2 [for some older calculators)
We don't do charity in Germany, we pay taxes. Charity is a failure of governments' responsibilities - Henning Wehn https://ddue.uk
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Joined: Jul 2008
Posts: 14,351 Likes: 20
Wiki Master
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Wiki Master
Joined: Jul 2008
Posts: 14,351 Likes: 20 |
Q6.
Ratio of 7:2 so there are 9 parts altogether (7 + 2)
We know 9 parts = 828 cm from the question
So each ONE part is 828/9 = 92 cm
We want 7 parts and 2 parts
7 * 92 = 644 cm
2 * 92 = 184 cm
Quick check is to add them together, 644 + 184 = 828 cm which is what the whole thing was so check is ok.
If I had bothered to read the question (doh!) I would have realised we just want the bigger part.
Last edited by diggingdeeper; 5th Jul 2010 8:59pm.
We don't do charity in Germany, we pay taxes. Charity is a failure of governments' responsibilities - Henning Wehn https://ddue.uk
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Joined: Aug 2008
Posts: 19,446
Wiki Master
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Wiki Master
Joined: Aug 2008
Posts: 19,446 |
gawd! i dont think i'd get a 'c' in my maths gcse if i had to do it again!!! i hate maths- got an 'f' in 5th year, another 'f' in 6th form. then a 'c' at night school in 1995. the only thing i can remember is percentages! 
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Joined: Nov 2009
Posts: 16
Newbeee
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Newbeee
Joined: Nov 2009
Posts: 16 |
Hope this helps:-
22 x 15 = 330
18 x 30 = 540
Therefore 330 + 540 = 870 Answer A
7 + 2 = 9
828 Divided By 9 = 9.2
9.2 x 7 = 644 Answer E
Long time since I did O'levels!!
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