SOLUTION: Mr. Carmona has a total of $1.60 in nickels and dimes. He has twice as many nickels as dimes. How many nickels and how many dimes does he have?

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Question 738155: Mr. Carmona has a total of $1.60 in nickels and dimes. He has twice as many nickels as dimes. How many nickels and how many dimes does he have?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
Nickels ----x
dimes -----------y

x=2y..........................(1)
Value of money. $1.60 = 160 cents
5x+!0y=160....................(2))
substitute x in eq (2)
5(2y)+!0y=160
10y+10y=160
20y=160
/20
y=8 number of dimes.
x=2y . so Nickels = 16
16*5+8*10=160