Question 474531: a coin bank contains $17.00 in pennies and nickles. If there are 1140 coins in the bank, how many of the coins are nickels? Answer by sofiyac(983) (Show Source):
You can put this solution on YOUR website! let x be the number of pennies and y be the number of nickels
0.01x+0.05y=17
x+y=1140
solve the system
y=1140-x
0.01x+0.05(1140-x)=17
0.01x+57-0.05x=17
0.01x+57-0.05x=17
-0.04x=-40
x=1000
y=1140-1000
y=140
so we have 1000 pennies and 140 nickels
