SOLUTION: Mayra has $0.25 in nickels and dimes. The number of dimes is 5 less than twice the number of nickels. Find the number of nickels, n, by solving the equation (you must show work to

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons -> SOLUTION: Mayra has $0.25 in nickels and dimes. The number of dimes is 5 less than twice the number of nickels. Find the number of nickels, n, by solving the equation (you must show work to       Log On


   

Question 1202217: Mayra has $0.25 in nickels and dimes. The number of dimes is 5 less than twice the number of nickels. Find the number of nickels, n, by solving the equation (you must show work to receive credit for this problem)
0.05n+0.10(2n-5)=0.25
Found 2 solutions by Alan3354, josgarithmetic:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Mayra has $0.25 in nickels and dimes. The number of dimes is 5 less than twice the number of nickels. Find the number of nickels, n, by solving the equation (you must show work to receive credit for this problem)
----------------
0.05n+0.10(2n-5)=0.25
0.05n + 0.2n - 0.5 = 0.25
0.25n = 0.75
n = 3 nickels
==========================
There are only 3 possible combinations:
1 N and 2 D's
or 3 N and 1 D
or 5 N's
--------------------
I have 2 coins that total 30 cents.
One of them is not a nickel. What are they?

Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
n nickels
2n-5 dimes
Money total 0.25 dollars

0.05n%2B0.1%282n-5%29=0.25
0.05%2B0.2n-0.5=0.25
0.25n=0.25%2B0.5
0.25n=0.75
highlight%28n=3%29------nickels

2%2A3-5
highlight%281%29--------dime