SOLUTION: I worked for a while just trying to find a good formula for this problem and all the ones i found and ennded up solving, came out horribly wrong: A coin bank contains $17.00 in

Question 129279: I worked for a while just trying to find a good formula for this problem and all the ones i found and ennded up solving, came out horribly wrong:
A coin bank contains $17.00 in pennies and nickels. If there are 1140 coins in the bank, how many of the coins are nickels?
I've been working on it for a while but i always end up eleminating any variables, and i know that isn;t going to help me solve what ever formula i am supposed to use.

Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
P = pennies
N = nickels
P+N = 1140
P+5N = 1700 (each nickel is 5 cents)
----------
P = 1140 - N
Sub for P in 2nd eqn
(1140 - N) + 5N = 1700
1140 + 4N = 1700
4N = 560
N = 140
------
P = 1140 - N
P = 1000

RELATED QUESTIONS
I really need help trying to figure this out. I don't want an answer I just need help... (answered by stanbon)

I have been struggling with a word problem. The problem is "Best rentals charges a daily (answered by math_tutor2020,ikleyn,josgarithmetic,MathTherapy)

Good Evening. I am trying to find the formula to find the volume for a spherical shape.... (answered by stanbon)

hello, I would be extremely grateful for any help or advice for this problem. It has... (answered by stanbon)

Hello I have a problem that is nonlinear and cramer's rule or Gaussian elimination... (answered by jim_thompson5910,actuary)

I need to understand this problem. I can not seem to isolate the "i" which is interest. I (answered by stanbon)

Suppose the population density in the Wichita, Kansas, area is related to the distance... (answered by jim_thompson5910)

Tomorrow I have a test on slope intercept form, and solving system of equation. For slope (answered by stanbon)

X+3 X _________ - _____ = X 4 2 I have worked this problem for... (answered by Mathtut)