Question 355733

Your equation is correct, but I would avoid decimals if possible.

Express everything in cents: 5N + 10D + 25Q = 85.  This is your first equation.  Keep in mind that there are 10 coins but we don't know how many of each kind.

So, N + D + Q = 10 is your second equation.

We now have a system of two linear equations.


5N + 10D + 25Q = 85
N + D + Q = 10


Can you take it from here?