Joe has a collection of nickels and dimes that is worth $6.05. If the number of dimes was doubled and the number of nickels was decreased by 10, the value of the coins would be $9.85. How many dimes does he have?
My Set Up:
n + d = 6.05..............Equation A
(n - 10) + 2d = 9.85...Equation B
I realize that we have two equations in two unknowns.
What is wrong with my equations?
I keep getting a negative answer for coins and this does not make sense.