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MrZone9
A box contains 35 coins in quarters and nickels worth $3.15 How many of each coin are there (system of liner eqations problem)
Q + N = 35 25Q + 5N = 315.
Simplyf the second equation, solve the first for one of its unknowns and substitute into the simplified second equation, and you're well on your way to the solution.
careful with the decimals! \[25q+5(35-q)=315\] \[
\[20x+175=315\] \[20x=140\] \[x=7\]