SOLUTION: john has 18 coins all nickels and dimes. if he has $1.45, how much does he have?

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Question 572239: john has 18 coins all nickels and dimes. if he has $1.45, how much does he have?
Answer by nyc_function(2741) About Me  (Show Source):
You can put this solution on YOUR website!
Here is the system of equations you need:
a + b = 18
0.05a + 0.10b = 1.45

Solve using the substitution method.