SOLUTION: 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?
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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
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