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by bodyoflies » Sun Nov 09, 2008 8:00 pm
Any easy way to solve such kinda problems?
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by stop@800 » Sun Nov 09, 2008 9:16 pm
IMO A

I could not find any shortcut so solved for P and C in ternms of D

equations will be
5D + 35C = 7P
and
D + P = 14C

solve for P and C in terms of D

you will get
P = 105D/63
C = 12D/63

now
P+28C

you will get 7 as answer

I am sure there must be some shortcut but can't think of the same at this time :)
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by 4meonly » Tue Nov 11, 2008 12:35 am
stop@800 wrote: solve for P and C in terms of D

you will get
P = 105D/63
C = 12D/63
It's a hard morning 4me today :?
Could you please elaborate this procedure?
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by vishubn » Tue Nov 11, 2008 12:45 am
stop@800 wrote:

solve for P and C in terms of D

you will get
P = 105D/63
C = 12D/63


It's a hard morning 4me today Confused
Could you please elaborate this procedure?
I am sure Stop@800 wont mind !

First step goes in setting up equations !!

equations will be
5D + 35C = 7P
and
D + P = 14C
D is dollar , C cents, P Pounds So i guess this would be straight forward from the question

and motive is to find the equivalent of pound and 35 cents

solvign the aboe eq for P and C

u get
P = 105D/63
C = 12D/63
p + 28C

105D/63+ [28*12D]/63
439D/63

7Dollars is the answer

Vishu
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by stop@800 » Tue Nov 11, 2008 1:45 am
vishubn wrote:
stop@800 wrote:

solve for P and C in terms of D

you will get
P = 105D/63
C = 12D/63


It's a hard morning 4me today Confused
Could you please elaborate this procedure?
I am sure Stop@800 wont mind !
Why will I :)
Please feel free to dig any post :)

First step goes in setting up equations !!

equations will be
5D + 35C = 7P
and
D + P = 14C
D is dollar , C cents, P Pounds So i guess this would be straight forward from the question

and motive is to find the equivalent of pound and 35 cents

solvign the aboe eq for P and C

u get
P = 105D/63
C = 12D/63
p + 28C

105D/63+ [28*12D]/63
439D/63

7Dollars is the answer

Vishu
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by 4meonly » Tue Nov 11, 2008 2:54 am
Guys I got nice evening yesterday and I am stuk with calculations how to get
stop@800 wrote: P = 105D/63
C = 12D/63
I understand the strategy but stuck with tactics.

Could please somebody post detailed calculations how to get
P = 105D/63
C = 12D/63

from
5D + 35C = 7P
and
D + P = 14C

Thanx in advance
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by stop@800 » Tue Nov 11, 2008 3:00 am
5D + 35C = 7P
D + P = 14C


7P - 35C = 5D
-P + 14C = D

equn 2 * seven
and add both


7P - 35C = 5D
-7P + 98C = 7D
=============
63C = 12D

C = 12D / 63

substitute c in
D + P = 14C


Hope this helps
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