Problema Solution
I have pennies, nickels, dimes, quarters , one dollar bills, and five dollar bills. There are twice as many nickels as pennies, twice as many dimes as nickels, three fewer quarters than dimes and the same number of one dollar bills and five dollar as there are nickels. The total value of the money I have is $93.82. How many dimes do I have?
Answer provided by our tutors
1 penny = 1 cent
1 nickle = 5 cents
1 dime = 10 cents
1 quarter = 25 cents
let
p = the number of pennies, p>0, p is integer
n = the number of nickels, n>0, n is integer
d = the number of dimes, d>0, d is integer
q = the number of quarters, q>0, q is integer
a = the number of $1 bills, a>0
b = the number of $5 bills, b>0
There are twice as many nickels as pennies,
n = 2p
p = (1/2)n
twice as many dimes as nickels,
d = 2n
n = (1/2)d
three fewer quarters than dimes
q = d - 3
q = 2n - 3
and the same number of one dollar bills and five dollar as there are nickels
a + b = n
The total value of the money I have is $93.82 = 9382 cents:
p + 5n + 10d + 25q + 100a + 500b = 9382
lets plug the values from above in the last equation:
(1/2)n + 5n + 10(2n) + 25(2n - 3) + 100n + 400b = 9283
by solving we find:
3/2(117n - 50) + 400b = 9283
plug n = (1/2)d into last equation and solve by d:
3/2(117(1/2)d - 50) + 400b = 9283
d = (8/351)(4679 - 200b) dimes