Maths - bar method -stumped

[User]

 

[Markymark]

P= 288
A=432
LS= 360

We know p=288
So p+a= 792

We also know p-a=2(ls-a)
So 288-a = 2ls -2a
Gives 288= 2ls-a
Gives a=2ls-288
Substitute above equation gives
3ls=1080

You can then solve all

 

[Soltydog]

I reckon Prasad got £432 , Lee Suan got £360 & Amir £288

 

[Soltydog]

It's probably worked out differently nowadays with rounding & stuff Maths was my subject at school, but when i recently tried helping with homework I just confused matters even more, as methods of teaching/calculation have changed quite a bit in the last 30 or so years

 

[Markymark]

[QUOTE 4494371, member: 45"]Thanks. How did you work that out? We need to show bar method working.[/QUOTE]
Edited to show

 

[ColinJ]

I have absolutely no idea what the 'bar method' is but that is a simple problem to solve ...

L + A + P = 1080

A = 288

Therefore (1) L + P = 1080 - 288 = 792

(P - A) = 2 x (L - A)

Rearranging ...

2L - P = A

(2) 2L - P = 288

Add (1) and (2) ...

L + P + 2L - P = 792 + 288

so 3L = 1080, L = 360

And P = 792 -360 = 432

A = 288, L = 360, P = 432

Divide those by 72 ... A : L : P = 4 : 5 : 6

Or putting it another way ...

Bloody @Markymark beat me to it while I was typing my reply!

 

[Profpointy]

I've never heard of "the bar method". Can anyone explain the question.

I have a maths degree so can easily get the answer, but by simple algebra rather than whatever the bar methid may be

 

[nickyboy]

P= 288
A=432
LS= 360

We know p=288
So p+a= 792

We also know p-a=2(ls-a)
So 288-a = 2ls -2a
Gives 288= 2ls-a
Gives a=2ls-288
Substitute above equation gives
3ls=1080

You can then solve all

You mixed up Prasad and Amir

Anyway, that kind of money is pocket change for Londoners, innit?

BTW, a quick google suggests the "Bar Method" is something developed in Singapore to aid the teaching of mathematics

 

[Pro Tour Punditry]

I see others have already provided the answer, such a shame as I was just readying myself to tell you the answer...

 

[ColinJ]

I've never heard of "the bar method". Can anyone explain the question.

I have a maths degree so can easily get the answer, but by simple algebra rather than whatever the bar methid may be

Ah, I found this explanation ...

I never had a problem with numbers (or words) so I can't see how that helps, but I'm sure that the experts know what they are talking about!

 

[PeteXXX]

I am so glad I have a bus pass and don't have to worry that I've been conned out of my change by the bus conductor!

 

[Markymark]

You mixed up Prasad and Amir

Anyway, that kind of money is pocket change for Londoners, innit?

Probs. Pencil and paper to solve then typed in on phone which is fiddly!!

Stupid iPhone, must get me a 7 to solve!!

 

[ColinJ]

 

[Profpointy]

thanks - now I know what the bar method is, it looks like you need to solve the problem using simple algebra then draw a to-scale "bar" to represent each answer.

Not sure how this helps though

 

[Tin Pot]

[QUOTE 4494341, member: 45"]Just spent ages with the boy on this. I can't even get to an equation, let alone work it out using the bar method. I did A-level maths all those years ago, and he's in year 10. Any maths experts on here?...

Lee Suan, Amir and Prasad shared £1080. Amir received £288. The difference between Prasad and Amir was double that of the difference between Lee Suan and Amir. In what ratio did they split their money, and how much did each person get?[/QUOTE]

Ok let's have a crack.

S+a+p=1080
A=288
The difference d = s - a
Consequently,
P = a + 2d
Also
S = a + d

Hmm or you could just say that
1080 - 3*288 = 864.
1080-864 = 216.
216/3 = 72, which is the difference.

So,
A = 288
S = 360
P = 432

You can donthe ratios from there.